All these steps to create summary groups are explained with screen shots HERE.

 

Create a summary for the tasks that you wish to see on the report.
Add those summaries into a Summary Group and name it accordingly.
Example we need a report to check the progress of the drafting department alone.  Call the Group’ Drafting Progress Summary’.
Set up summaries for all the tasks you wish to see on the report. (Do not create new summary if we already have one with the same name).
Link all those summaries to the Summary group that we just created. (One summary can be in more than one groups)
Now while running the ‘Progress Summary Report’ from the Report section, by choosing the desired summary group name.