Add Reference Dialog Box
Use the Add Reference dialog box to add references to a custom assembly or .NET Framework component to your report. After you add an assembly reference, you can write expressions or embedded custom code that includes fully qualified references to classes or methods in the assembly or component. For more information, see Custom Code and Assembly References in Expressions in Report Designer (SSRS) or Add an Assembly Reference to a Report (SSRS).
Use to select a .NET Framework component or an assembly installed in the global assembly cache (GAC).
Use to browse to an external assembly on your file system.
When you publish a report that includes a reference to an external assembly, the assembly must be installed on the report server before the report can be processed successfully.
Use to select the name of a recently used assembly.