Multiple xsd files...

Have you tried
http://www.oxygenxml.com/
?

Yes - just include the XSD contents inside a <schema></schema> in your WSDL:

<?xml ...
<wsdl:definitions
  <wsdl:types>
    <xs:schema
         the contents here
   </xs:schema>
  </wsdl:types>
  <wsdl:message
     the rest of your wsdl
</wsdl:definitions>

marklorenz:
can you do that for me?
I have little to no experience at all with this

Here is the code for the wsdl:

<?xml version="1.0" encoding="utf-8"?><wsdl:definitions name="QuotationManagementService" targetNamespace="http://tempuri.org/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:wsam="http://www.w3.org/2007/05/addressing/metadata" xmlns:tns="http://tempuri.org/" xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing" xmlns:wsp="http://schemas.xmlsoap.org/ws/2004/09/policy" xmlns:wsap="http://schemas.xmlsoap.org/ws/2004/08/addressing/policy" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msc="http://schemas.microsoft.com/ws/2005/12/wsdl/contract" xmlns:wsaw="http://www.w3.org/2006/05/addressing/wsdl" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/" xmlns:wsa10="http://www.w3.org/2005/08/addressing" xmlns:wsx="http://schemas.xmlsoap.org/ws/2004/09/mex"><wsp:Policy wsu:Id="BasicHttpBinding_IQuotationManagementService_policy"><wsp:ExactlyOne><wsp:All><sp:TransportBinding xmlns:sp="http://schemas.xmlsoap.org/ws/2005/07/securitypolicy"><wsp:Policy><sp:TransportToken><wsp:Policy><sp:HttpsToken RequireClientCertificate="false"/></wsp:Policy></sp:TransportToken><sp:AlgorithmSuite><wsp:Policy><sp:Basic256/></wsp:Policy></sp:AlgorithmSuite><sp:Layout><wsp:Policy><sp:Strict/></wsp:Policy></sp:Layout></wsp:Policy></sp:TransportBinding></wsp:All></wsp:ExactlyOne></wsp:Policy><wsdl:types><xsd:schema targetNamespace="http://tempuri.org/Imports"><xsd:import schemaLocation="https://azt-direct/SharedWebServices.DEV/QuotationManagementService.svc?xsd=xsd0" namespace="http://tempuri.org/"/><xsd:import schemaLocation="https://azt-direct/SharedWebServices.DEV/QuotationManagementService.svc?xsd=xsd1" namespace="http://schemas.microsoft.com/2003/10/Serialization/"/><xsd:import schemaLocation="https://azt-direct/SharedWebServices.DEV/QuotationManagementService.svc?xsd=xsd2" namespace="http://schemas.datacontract.org/2004/07/AZT.NET.Insurance.Entities.Auto"/><xsd:import schemaLocation="https://azt-direct/SharedWebServices.DEV/QuotationManagementService.svc?xsd=xsd3" namespace="http://schemas.datacontract.org/2004/07/AZT.NET.Common.Entities"/></xsd:schema></wsdl:types><wsdl:message name="IQuotationManagementService_GetBonusMalusByPolicyNo_InputMessage"><wsdl:part name="parameters" element="tns:GetBonusMalusByPolicyNo"/></wsdl:message><wsdl:message name="IQuotationManagementService_GetBonusMalusByPolicyNo_OutputMessage"><wsdl:part name="parameters" element="tns:GetBonusMalusByPolicyNoResponse"/></wsdl:message><wsdl:message name="IQuotationManagementService_GetBonusMalusByUIAndVin_InputMessage"><wsdl:part name="parameters" element="tns:GetBonusMalusByUIAndVin"/></wsdl:message><wsdl:message name="IQuotationManagementService_GetBonusMalusByUIAndVin_OutputMessage"><wsdl:part name="parameters" element="tns:GetBonusMalusByUIAndVinResponse"/></wsdl:message><wsdl:message name="IQuotationManagementService_ValidateCedamService_InputMessage"><wsdl:part name="parameters" element="tns:ValidateCedamService"/></wsdl:message><wsdl:message name="IQuotationManagementService_ValidateCedamService_OutputMessage"><wsdl:part name="parameters" element="tns:ValidateCedamServiceResponse"/></wsdl:message><wsdl:message name="IQuotationManagementService_CreateQuotationRco_InputMessage"><wsdl:part name="parameters" element="tns:CreateQuotationRco"/></wsdl:message><wsdl:message name="IQuotationManagementService_CreateQuotationRco_OutputMessage"><wsdl:part name="parameters" element="tns:CreateQuotationRcoResponse"/></wsdl:message><wsdl:message name="IQuotationManagementService_CreateQuotationRcoPj_InputMessage"><wsdl:part name="parameters" element="tns:CreateQuotationRcoPj"/></wsdl:message><wsdl:message name="IQuotationManagementService_CreateQuotationRcoPj_OutputMessage"><wsdl:part name="parameters" element="tns:CreateQuotationRcoPjResponse"/></wsdl:message><wsdl:message name="IQuotationManagementService_CreateQuotationCasco_InputMessage"><wsdl:part name="parameters" element="tns:CreateQuotationCasco"/></wsdl:message><wsdl:message name="IQuotationManagementService_CreateQuotationCasco_OutputMessage"><wsdl:part name="parameters" element="tns:CreateQuotationCascoResponse"/></wsdl:message><wsdl:message name="IQuotationManagementService_CreateQuotationTravel_InputMessage"><wsdl:part name="parameters" element="tns:CreateQuotationTravel"/></wsdl:message><wsdl:message name="IQuotationManagementService_CreateQuotationTravel_OutputMessage"><wsdl:part name="parameters" element="tns:CreateQuotationTravelResponse"/></wsdl:message><wsdl:message name="IQuotationManagementService_BrowseCategoriesRco_InputMessage"><wsdl:part name="parameters" element="tns:BrowseCategoriesRco"/></wsdl:message><wsdl:message name="IQuotationManagementService_BrowseCategoriesRco_OutputMessage"><wsdl:part name="parameters" element="tns:BrowseCategoriesRcoResponse"/></wsdl:message><wsdl:message name="IQuotationManagementService_BrowseCategoriesRcoComplete_InputMessage"><wsdl:part name="parameters" element="tns:BrowseCategoriesRcoComplete"/></wsdl:message><wsdl:message name="IQuotationManagementService_BrowseCategoriesRcoComplete_OutputMessage"><wsdl:part name="parameters" element="tns:BrowseCategoriesRcoCompleteResponse"/></wsdl:message><wsdl:message name="IQuotationManagementService_BrowseCategoriesCasco_InputMessage"><wsdl:part name="parameters" element="tns:BrowseCategoriesCasco"/></wsdl:message><wsdl:message name="IQuotationManagementService_BrowseCategoriesCasco_OutputMessage"><wsdl:part name="parameters" element="tns:BrowseCategoriesCascoResponse"/></wsdl:message><wsdl:message name="IQuotationManagementService_BrowseBrands_InputMessage"><wsdl:part name="parameters" element="tns:BrowseBrands"/></wsdl:message><wsdl:message name="IQuotationManagementService_BrowseBrands_OutputMessage"><wsdl:part name="parameters" element="tns:BrowseBrandsResponse"/></wsdl:message><wsdl:message name="IQuotationManagementService_BrowseModels_InputMessage"><wsdl:part name="parameters" element="tns:BrowseModels"/></wsdl:message><wsdl:message name="IQuotationManagementService_BrowseModels_OutputMessage"><wsdl:part name="parameters" element="tns:BrowseModelsResponse"/></wsdl:message><wsdl:portType name="IQuotationManagementService"><wsdl:operation name="GetBonusMalusByPolicyNo"><wsdl:input wsaw:Action="http://tempuri.org/IQuotationManagementService/GetBonusMalusByPolicyNo" message="tns:IQuotationManagementService_GetBonusMalusByPolicyNo_InputMessage"/><wsdl:output wsaw:Action="http://tempuri.org/IQuotationManagementService/GetBonusMalusByPolicyNoResponse" message="tns:IQuotationManagementService_GetBonusMalusByPolicyNo_OutputMessage"/></wsdl:operation><wsdl:operation name="GetBonusMalusByUIAndVin"><wsdl:input wsaw:Action="http://tempuri.org/IQuotationManagementService/GetBonusMalusByUIAndVin" message="tns:IQuotationManagementService_GetBonusMalusByUIAndVin_InputMessage"/><wsdl:output wsaw:Action="http://tempuri.org/IQuotationManagementService/GetBonusMalusByUIAndVinResponse" message="tns:IQuotationManagementService_GetBonusMalusByUIAndVin_OutputMessage"/></wsdl:operation><wsdl:operation name="ValidateCedamService"><wsdl:input wsaw:Action="http://tempuri.org/IQuotationManagementService/ValidateCedamService" message="tns:IQuotationManagementService_ValidateCedamService_InputMessage"/><wsdl:output wsaw:Action="http://tempuri.org/IQuotationManagementService/ValidateCedamServiceResponse" message="tns:IQuotationManagementService_ValidateCedamService_OutputMessage"/></wsdl:operation><wsdl:operation name="CreateQuotationRco"><wsdl:input wsaw:Action="http://tempuri.org/IQuotationManagementService/CreateQuotationRco" message="tns:IQuotationManagementService_CreateQuotationRco_InputMessage"/><wsdl:output wsaw:Action="http://tempuri.org/IQuotationManagementService/CreateQuotationRcoResponse" message="tns:IQuotationManagementService_CreateQuotationRco_OutputMessage"/></wsdl:operation><wsdl:operation name="CreateQuotationRcoPj"><wsdl:input wsaw:Action="http://tempuri.org/IQuotationManagementService/CreateQuotationRcoPj" message="tns:IQuotationManagementService_CreateQuotationRcoPj_InputMessage"/><wsdl:output wsaw:Action="http://tempuri.org/IQuotationManagementService/CreateQuotationRcoPjResponse" message="tns:IQuotationManagementService_CreateQuotationRcoPj_OutputMessage"/></wsdl:operation><wsdl:operation name="CreateQuotationCasco"><wsdl:input wsaw:Action="http://tempuri.org/IQuotationManagementService/CreateQuotationCasco" message="tns:IQuotationManagementService_CreateQuotationCasco_InputMessage"/><wsdl:output wsaw:Action="http://tempuri.org/IQuotationManagementService/CreateQuotationCascoResponse" message="tns:IQuotationManagementService_CreateQuotationCasco_OutputMessage"/></wsdl:operation><wsdl:operation name="CreateQuotationTravel"><wsdl:input wsaw:Action="http://tempuri.org/IQuotationManagementService/CreateQuotationTravel" message="tns:IQuotationManagementService_CreateQuotationTravel_InputMessage"/><wsdl:output wsaw:Action="http://tempuri.org/IQuotationManagementService/CreateQuotationTravelResponse" message="tns:IQuotationManagementService_CreateQuotationTravel_OutputMessage"/></wsdl:operation><wsdl:operation name="BrowseCategoriesRco"><wsdl:input wsaw:Action="http://tempuri.org/IQuotationManagementService/BrowseCategoriesRco" message="tns:IQuotationManagementService_BrowseCategoriesRco_InputMessage"/><wsdl:output wsaw:Action="http://tempuri.org/IQuotationManagementService/BrowseCategoriesRcoResponse" message="tns:IQuotationManagementService_BrowseCategoriesRco_OutputMessage"/></wsdl:operation><wsdl:operation name="BrowseCategoriesRcoComplete"><wsdl:input wsaw:Action="http://tempuri.org/IQuotationManagementService/BrowseCategoriesRcoComplete" message="tns:IQuotationManagementService_BrowseCategoriesRcoComplete_InputMessage"/><wsdl:output wsaw:Action="http://tempuri.org/IQuotationManagementService/BrowseCategoriesRcoCompleteResponse" message="tns:IQuotationManagementService_BrowseCategoriesRcoComplete_OutputMessage"/></wsdl:operation><wsdl:operation name="BrowseCategoriesCasco"><wsdl:input wsaw:Action="http://tempuri.org/IQuotationManagementService/BrowseCategoriesCasco" message="tns:IQuotationManagementService_BrowseCategoriesCasco_InputMessage"/><wsdl:output wsaw:Action="http://tempuri.org/IQuotationManagementService/BrowseCategoriesCascoResponse" message="tns:IQuotationManagementService_BrowseCategoriesCasco_OutputMessage"/></wsdl:operation><wsdl:operation name="BrowseBrands"><wsdl:input wsaw:Action="http://tempuri.org/IQuotationManagementService/BrowseBrands" message="tns:IQuotationManagementService_BrowseBrands_InputMessage"/><wsdl:output wsaw:Action="http://tempuri.org/IQuotationManagementService/BrowseBrandsResponse" message="tns:IQuotationManagementService_BrowseBrands_OutputMessage"/></wsdl:operation><wsdl:operation name="BrowseModels"><wsdl:input wsaw:Action="http://tempuri.org/IQuotationManagementService/BrowseModels" message="tns:IQuotationManagementService_BrowseModels_InputMessage"/><wsdl:output wsaw:Action="http://tempuri.org/IQuotationManagementService/BrowseModelsResponse" message="tns:IQuotationManagementService_BrowseModels_OutputMessage"/></wsdl:operation></wsdl:portType><wsdl:binding name="BasicHttpBinding_IQuotationManagementService" type="tns:IQuotationManagementService"><wsp:PolicyReference URI="#BasicHttpBinding_IQuotationManagementService_policy"/><soap:binding transport="http://schemas.xmlsoap.org/soap/http"/><wsdl:operation name="GetBonusMalusByPolicyNo"><soap:operation soapAction="http://tempuri.org/IQuotationManagementService/GetBonusMalusByPolicyNo" style="document"/><wsdl:input><soap:body use="literal"/></wsdl:input><wsdl:output><soap:body use="literal"/></wsdl:output></wsdl:operation><wsdl:operation name="GetBonusMalusByUIAndVin"><soap:operation soapAction="http://tempuri.org/IQuotationManagementService/GetBonusMalusByUIAndVin" style="document"/><wsdl:input><soap:body use="literal"/></wsdl:input><wsdl:output><soap:body use="literal"/></wsdl:output></wsdl:operation><wsdl:operation name="ValidateCedamService"><soap:operation soapAction="http://tempuri.org/IQuotationManagementService/ValidateCedamService" style="document"/><wsdl:input><soap:body use="literal"/></wsdl:input><wsdl:output><soap:body use="literal"/></wsdl:output></wsdl:operation><wsdl:operation name="CreateQuotationRco"><soap:operation soapAction="http://tempuri.org/IQuotationManagementService/CreateQuotationRco" style="document"/><wsdl:input><soap:body use="literal"/></wsdl:input><wsdl:output><soap:body use="literal"/></wsdl:output></wsdl:operation><wsdl:operation name="CreateQuotationRcoPj"><soap:operation soapAction="http://tempuri.org/IQuotationManagementService/CreateQuotationRcoPj" style="document"/><wsdl:input><soap:body use="literal"/></wsdl:input><wsdl:output><soap:body use="literal"/></wsdl:output></wsdl:operation><wsdl:operation name="CreateQuotationCasco"><soap:operation soapAction="http://tempuri.org/IQuotationManagementService/CreateQuotationCasco" style="document"/><wsdl:input><soap:body use="literal"/></wsdl:input><wsdl:output><soap:body use="literal"/></wsdl:output></wsdl:operation><wsdl:operation name="CreateQuotationTravel"><soap:operation soapAction="http://tempuri.org/IQuotationManagementService/CreateQuotationTravel" style="document"/><wsdl:input><soap:body use="literal"/></wsdl:input><wsdl:output><soap:body use="literal"/></wsdl:output></wsdl:operation><wsdl:operation name="BrowseCategoriesRco"><soap:operation soapAction="http://tempuri.org/IQuotationManagementService/BrowseCategoriesRco" style="document"/><wsdl:input><soap:body use="literal"/></wsdl:input><wsdl:output><soap:body use="literal"/></wsdl:output></wsdl:operation><wsdl:operation name="BrowseCategoriesRcoComplete"><soap:operation soapAction="http://tempuri.org/IQuotationManagementService/BrowseCategoriesRcoComplete" style="document"/><wsdl:input><soap:body use="literal"/></wsdl:input><wsdl:output><soap:body use="literal"/></wsdl:output></wsdl:operation><wsdl:operation name="BrowseCategoriesCasco"><soap:operation soapAction="http://tempuri.org/IQuotationManagementService/BrowseCategoriesCasco" style="document"/><wsdl:input><soap:body use="literal"/></wsdl:input><wsdl:output><soap:body use="literal"/></wsdl:output></wsdl:operation><wsdl:operation name="BrowseBrands"><soap:operation soapAction="http://tempuri.org/IQuotationManagementService/BrowseBrands" style="document"/><wsdl:input><soap:body use="literal"/></wsdl:input><wsdl:output><soap:body use="literal"/></wsdl:output></wsdl:operation><wsdl:operation name="BrowseModels"><soap:operation soapAction="http://tempuri.org/IQuotationManagementService/BrowseModels" style="document"/><wsdl:input><soap:body use="literal"/></wsdl:input><wsdl:output><soap:body use="literal"/></wsdl:output></wsdl:operation></wsdl:binding><wsdl:service name="QuotationManagementService"><wsdl:port name="BasicHttpBinding_IQuotationManagementService" binding="tns:BasicHttpBinding_IQuotationManagementService"><soap:address location="https://azt-direct/SharedWebServices.DEV/QuotationManagementService.svc"/></wsdl:port></wsdl:service></wsdl:definitions>

And now xsd0:

<?xml version="1.0" encoding="utf-8"?><xs:schema elementFormDefault="qualified" targetNamespace="http://tempuri.org/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://tempuri.org/"><xs:import schemaLocation="https://azt-direct/SharedWebServices.DEV/QuotationManagementService.svc?xsd=xsd2" namespace="http://schemas.datacontract.org/2004/07/AZT.NET.Insurance.Entities.Auto"/><xs:element name="GetBonusMalusByPolicyNo"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="policySerial" nillable="true" type="xs:string"/><xs:element minOccurs="0" name="policyNo" nillable="true" type="xs:string"/></xs:sequence></xs:complexType></xs:element><xs:element name="GetBonusMalusByPolicyNoResponse"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="GetBonusMalusByPolicyNoResult" nillable="true" type="xs:string"/></xs:sequence></xs:complexType></xs:element><xs:element name="GetBonusMalusByUIAndVin"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="uniqueIdentifier" nillable="true" type="xs:string"/><xs:element minOccurs="0" name="vin" nillable="true" type="xs:string"/></xs:sequence></xs:complexType></xs:element><xs:element name="GetBonusMalusByUIAndVinResponse"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="GetBonusMalusByUIAndVinResult" nillable="true" type="xs:string"/></xs:sequence></xs:complexType></xs:element><xs:element name="ValidateCedamService"><xs:complexType><xs:sequence/></xs:complexType></xs:element><xs:element name="ValidateCedamServiceResponse"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="ValidateCedamServiceResult" type="xs:boolean"/></xs:sequence></xs:complexType></xs:element><xs:element name="CreateQuotationRco"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="xquotation" nillable="true" type="xs:string"/></xs:sequence></xs:complexType></xs:element><xs:element name="CreateQuotationRcoResponse"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="CreateQuotationRcoResult" nillable="true" type="xs:string"/></xs:sequence></xs:complexType></xs:element><xs:element name="CreateQuotationRcoPj"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="xquotation" nillable="true" type="xs:string"/></xs:sequence></xs:complexType></xs:element><xs:element name="CreateQuotationRcoPjResponse"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="CreateQuotationRcoPjResult" nillable="true" type="xs:string"/></xs:sequence></xs:complexType></xs:element><xs:element name="CreateQuotationCasco"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="xquotation" nillable="true" type="xs:string"/></xs:sequence></xs:complexType></xs:element><xs:element name="CreateQuotationCascoResponse"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="CreateQuotationCascoResult" nillable="true" type="xs:string"/></xs:sequence></xs:complexType></xs:element><xs:element name="CreateQuotationTravel"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="xquotation" nillable="true" type="xs:string"/></xs:sequence></xs:complexType></xs:element><xs:element name="CreateQuotationTravelResponse"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="CreateQuotationTravelResult" nillable="true" type="xs:string"/></xs:sequence></xs:complexType></xs:element><xs:element name="BrowseCategoriesRco"><xs:complexType><xs:sequence/></xs:complexType></xs:element><xs:element name="BrowseCategoriesRcoResponse"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="BrowseCategoriesRcoResult" nillable="true" type="q1:ArrayOfCategorySummary" xmlns:q1="http://schemas.datacontract.org/2004/07/AZT.NET.Insurance.Entities.Auto"/></xs:sequence></xs:complexType></xs:element><xs:element name="BrowseCategoriesRcoComplete"><xs:complexType><xs:sequence/></xs:complexType></xs:element><xs:element name="BrowseCategoriesRcoCompleteResponse"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="BrowseCategoriesRcoCompleteResult" nillable="true" type="q2:ArrayOfCategorySummary" xmlns:q2="http://schemas.datacontract.org/2004/07/AZT.NET.Insurance.Entities.Auto"/></xs:sequence></xs:complexType></xs:element><xs:element name="BrowseCategoriesCasco"><xs:complexType><xs:sequence/></xs:complexType></xs:element><xs:element name="BrowseCategoriesCascoResponse"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="BrowseCategoriesCascoResult" nillable="true" type="q3:ArrayOfCategorySummary" xmlns:q3="http://schemas.datacontract.org/2004/07/AZT.NET.Insurance.Entities.Auto"/></xs:sequence></xs:complexType></xs:element><xs:element name="BrowseBrands"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="categoryid" type="xs:int"/></xs:sequence></xs:complexType></xs:element><xs:element name="BrowseBrandsResponse"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="BrowseBrandsResult" nillable="true" type="q4:ArrayOfBrandSummary" xmlns:q4="http://schemas.datacontract.org/2004/07/AZT.NET.Insurance.Entities.Auto"/></xs:sequence></xs:complexType></xs:element><xs:element name="BrowseModels"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="categoryid" type="xs:int"/><xs:element minOccurs="0" name="brandid" type="xs:int"/></xs:sequence></xs:complexType></xs:element><xs:element name="BrowseModelsResponse"><xs:complexType><xs:sequence><xs:element minOccurs="0" name="BrowseModelsResult" nillable="true" type="q5:ArrayOfAutoMapItem" xmlns:q5="http://schemas.datacontract.org/2004/07/AZT.NET.Insurance.Entities.Auto"/></xs:sequence></xs:complexType></xs:element></xs:schema>

and xsd1:
<?xml version="1.0" encoding="utf-8"?><xs:schema attributeFormDefault="qualified" elementFormDefault="qualified" targetNamespace="http://schemas.microsoft.com/2003/10/Serialization/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://schemas.microsoft.com/2003/10/Serialization/"><xs:element name="anyType" nillable="true" type="xs:anyType"/><xs:element name="anyURI" nillable="true" type="xs:anyURI"/><xs:element name="base64Binary" nillable="true" type="xs:base64Binary"/><xs:element name="boolean" nillable="true" type="xs:boolean"/><xs:element name="byte" nillable="true" type="xs:byte"/><xs:element name="dateTime" nillable="true" type="xs:dateTime"/><xs:element name="decimal" nillable="true" type="xs:decimal"/><xs:element name="double" nillable="true" type="xs:double"/><xs:element name="float" nillable="true" type="xs:float"/><xs:element name="int" nillable="true" type="xs:int"/><xs:element name="long" nillable="true" type="xs:long"/><xs:element name="QName" nillable="true" type="xs:QName"/><xs:element name="short" nillable="true" type="xs:short"/><xs:element name="string" nillable="true" type="xs:string"/><xs:element name="unsignedByte" nillable="true" type="xs:unsignedByte"/><xs:element name="unsignedInt" nillable="true" type="xs:unsignedInt"/><xs:element name="unsignedLong" nillable="true" type="xs:unsignedLong"/><xs:element name="unsignedShort" nillable="true" type="xs:unsignedShort"/><xs:element name="char" nillable="true" type="tns:char"/><xs:simpleType name="char"><xs:restriction base="xs:int"/></xs:simpleType><xs:element name="duration" nillable="true" type="tns:duration"/><xs:simpleType name="duration"><xs:restriction base="xs:duration"><xs:pattern value="\-?P(\d*D)?(T(\d*H)?(\d*M)?(\d*(\.\d*)?S)?)?"/><xs:minInclusive value="-P10675199DT2H48M5.4775808S"/><xs:maxInclusive value="P10675199DT2H48M5.4775807S"/></xs:restriction></xs:simpleType><xs:element name="guid" nillable="true" type="tns:guid"/><xs:simpleType name="guid"><xs:restriction base="xs:string"><xs:pattern value="[\da-fA-F]{8}-[\da-fA-F]{4}-[\da-fA-F]{4}-[\da-fA-F]{4}-[\da-fA-F]{12}"/></xs:restriction></xs:simpleType><xs:attribute name="FactoryType" type="xs:QName"/><xs:attribute name="Id" type="xs:ID"/><xs:attribute name="Ref" type="xs:IDREF"/></xs:schema>

and xsd2:
<?xml version="1.0" encoding="utf-8"?><xs:schema elementFormDefault="qualified" targetNamespace="http://schemas.datacontract.org/2004/07/AZT.NET.Insurance.Entities.Auto" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://schemas.datacontract.org/2004/07/AZT.NET.Insurance.Entities.Auto"><xs:import schemaLocation="https://azt-direct/SharedWebServices.DEV/QuotationManagementService.svc?xsd=xsd3" namespace="http://schemas.datacontract.org/2004/07/AZT.NET.Common.Entities"/><xs:complexType name="ArrayOfCategorySummary"><xs:sequence><xs:element minOccurs="0" maxOccurs="unbounded" name="CategorySummary" nillable="true" type="tns:CategorySummary"/></xs:sequence></xs:complexType><xs:element name="ArrayOfCategorySummary" nillable="true" type="tns:ArrayOfCategorySummary"/><xs:complexType name="CategorySummary"><xs:complexContent mixed="false"><xs:extension base="q1:EntityBase" xmlns:q1="http://schemas.datacontract.org/2004/07/AZT.NET.Common.Entities"><xs:sequence><xs:element minOccurs="0" name="Id" type="xs:int"/><xs:element minOccurs="0" name="Name" nillable="true" type="xs:string"/></xs:sequence></xs:extension></xs:complexContent></xs:complexType><xs:element name="CategorySummary" nillable="true" type="tns:CategorySummary"/><xs:complexType name="ArrayOfBrandSummary"><xs:sequence><xs:element minOccurs="0" maxOccurs="unbounded" name="BrandSummary" nillable="true" type="tns:BrandSummary"/></xs:sequence></xs:complexType><xs:element name="ArrayOfBrandSummary" nillable="true" type="tns:ArrayOfBrandSummary"/><xs:complexType name="BrandSummary"><xs:complexContent mixed="false"><xs:extension base="q2:EntityBase" xmlns:q2="http://schemas.datacontract.org/2004/07/AZT.NET.Common.Entities"><xs:sequence><xs:element minOccurs="0" name="Id" type="xs:int"/><xs:element minOccurs="0" name="Name" nillable="true" type="xs:string"/></xs:sequence></xs:extension></xs:complexContent></xs:complexType><xs:element name="BrandSummary" nillable="true" type="tns:BrandSummary"/><xs:complexType name="ArrayOfAutoMapItem"><xs:sequence><xs:element minOccurs="0" maxOccurs="unbounded" name="AutoMapItem" nillable="true" type="tns:AutoMapItem"/></xs:sequence></xs:complexType><xs:element name="ArrayOfAutoMapItem" nillable="true" type="tns:ArrayOfAutoMapItem"/><xs:complexType name="AutoMapItem"><xs:complexContent mixed="false"><xs:extension base="q3:EntityBase" xmlns:q3="http://schemas.datacontract.org/2004/07/AZT.NET.Common.Entities"><xs:sequence><xs:element minOccurs="0" name="ExternalBrandId" type="xs:int"/><xs:element minOccurs="0" name="ExternalCategoryId" type="xs:int"/><xs:element minOccurs="0" name="ExternalModelId" type="xs:int"/><xs:element minOccurs="0" name="ModelId" type="xs:int"/><xs:element minOccurs="0" name="ModelName" nillable="true" type="xs:string"/></xs:sequence></xs:extension></xs:complexContent></xs:complexType><xs:element name="AutoMapItem" nillable="true" type="tns:AutoMapItem"/></xs:schema>

and xsd3:
<?xml version="1.0" encoding="utf-8"?><xs:schema elementFormDefault="qualified" targetNamespace="http://schemas.datacontract.org/2004/07/AZT.NET.Common.Entities" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://schemas.datacontract.org/2004/07/AZT.NET.Common.Entities"><xs:complexType name="EntityBase"><xs:sequence/></xs:complexType><xs:element name="EntityBase" nillable="true" type="tns:EntityBase"/></xs:schema>

So all 4 XSD should be inside the initial WSDL.
I have no idea where to add the xsd contents, so please help me with it.

look closely at my answer above to see how to do it - all the xsd lines are nested inside <xs:schema> and </xs:schema>, just take out the initial lines (<?xml version...).  You may have to include multiple namespace lines (the xmlns:), but be aware that you cannot have multiple that are "tns", so duplicates must be renamed to something else, like "ent" for entity.

It seems very simple from your answer, and since it's all just about copy /paste, could you do it for me and test it? Because I tried the copy/paste thing and all kinds of errors showed up.
Also I have no ideea what "tns" is and what it is for.
I do not know XML, Delphi makes all the conversions necesary for me to work with WSDL + XSD as with any other delphi units.
I have no idea how to nest these nodes that you are talking about.
Please complete the answer by combining the WSDL with the XSDs.
Thank you

Great. I actually solved this in another thread, but since you bothered to answer me and spent your time to do it, I will award you the points Ghita.
Thanks