Here's how you set that up in the report:
1. Make sure that the main report contains the parameters that you want.
2. Right-click on the subreport and select "Change Subreport Links..."
3. In the top-left, select the field or parameter you want to use to filter the subreport and move it to the top-right, then select it in the top-right.
4. If you want to connect the value in the main report to a field in the subreport, select the field in the drop-down in the bottom-right.
5. If you want to connect the value in the main report to a parameter in the subreport, turn off "Select data in subreport based on field" and select the parameter in the drop-down in the bottom-left.
Repeat these steps for each parameter or field that you want to link.
-Dell