[Area] Drillthrough, Drilldown, Subreports, and Nested Data Regions [Report Designer] In local mode, add references to reports in the project for drillthrough targets or subreports. The Table or Matrix Wizard is not available. Manually add an expand/collapse action to an item on the Text Box Properties dialog box or the Group Dialog box from a group displayed in the Grouping pane. [Report Builder 3.0] 
Drillthrough and subreports are supported only in server mode. Not supported in local mode. Add an expand/collapse action to an item by using the Table or Matrix Wizard.