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Current: 
This formula expression is working as needed. 
=sum(IIf(Fields!CAT_ACTUAL_BUDGET.Value=&quot;Actual&quot;,Fields!SIGNEDDATA.Value,0)) 
 
Desired: 
Add Fields!DS.Value &quot;TOTW&quot; &nbsp; 
as a filter on the cell where the current formula runs 
=sum(IIf(Fields!CAT_ACTUAL_BUDGET.Value=&quot;Actual&quot;,Fields!SIGNEDDATA.Value,0)) 
 
If I can provide additional clarity please ask.
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Current:
This formula expression is working as needed.
=sum(IIf(Fields!CAT_ACTUAL_BUDGET.Value="Actual",Fields!SIGNEDDATA.Value,0)) 

Desired:
Add Fields!DS.Value "TOTW"  
as a filter on the cell where the current formula runs
=sum(IIf(Fields!CAT_ACTUAL_BUDGET.Value="Actual",Fields!SIGNEDDATA.Value,0)) 

If I can provide additional clarity please ask.

How can I add another field and another specific member in ssrs expression ?

SQL Server Reporting Services (SSRS) is a server-based report generation software system from Microsoft. It can prepare and deliver a variety of interactive and printed reports and is administered via a web interface or its web service. Its web services interface also supports the development of custom reporting applications. Finally, SSRS can also be integrated with SharePoint. SSRS competes with other business intelligence tools, most prominently Crystal Reports.

SSRS

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.

Microsoft SQL Server

SQL Server Analysis Services (SSAS) is an online analytical processing (OLAP) and data mining tool in Microsoft SQL Server used as a tool by organizations to analyze and make sense of information possibly spread out across multiple databases, or in disparate tables or files. Analysis Services includes a group of OLAP and data mining capabilities and comes in two flavors - Multidimensional and Tabular.