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Take a look here on how to configure the control with the filter values:<br />
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<a href="https://support.office.com/en-us/article/Enable-selection-through-choice-controls-check-and-list-boxes-c3616c0a-a898-4259-b8cc-06445349956c" rel="ugc">https://support.office.com/en-us/article/Enable-selection-through-choice-controls-check-and-list-boxes-c3616c0a-a898-4259-b8cc-06445349956c</a>
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Take a look here on how to configure the control with the filter values:

https://support.office.com/en-us/article/Enable-selection-through-choice-controls-check-and-list-boxes-c3616c0a-a898-4259-b8cc-06445349956c [https://support.office.com/en-us/article/Enable-selection-through-choice-controls-check-and-list-boxes-c3616c0a-a898-4259-b8cc-06445349956c]

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I have created an InfoPath form that has two fields which are of a drop down and check box where multiple selections can be made. &nbsp; Based upon the selection from that form, it should display the list of related documents in a below list. &nbsp;Because multiple options can be selected the Connection option doesn't help.
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I have created an InfoPath form that has two fields which are of a drop down and check box where multiple selections can be made.   Based upon the selection from that form, it should display the list of related documents in a below list.  Because multiple options can be selected the Connection option doesn't help.

SharePoint List Lookup

Microsoft Sharepoint is a software platform and family of software products used for collaboration and web publishing combined. These capabilities include developing web sites, portals, intranets, content management systems, search engines, wikis, blogs, and other tools for business intelligence and collaboration. SharePoint has a Microsoft Office-like interface, and it is closely integrated with the Office suite.

Microsoft SharePoint

Microsoft InfoPath is a software application for designing, distributing, filling and submitting electronic forms containing structured data. The product features a WYSIWYG form designer in which the various controls (e.g. textbox, radio button, checkbox) are bound to data, represented separately as a hierarchical tree view of folders and data fields. All the data stored in InfoPath forms are stored in an XML format. Secondary data sources can be built into the form or they can be accessed through an external data connection to SharePoint or a Web service.