1. Click the Reports tab.
2. Click New Report....
3. Click New Custom Report Type.
4. Expand the Activities folder.
5. Click a report. (For example, click Activities with Accounts.)
6. Click Create
7. Drag and drop the Relation Count field onto the report.
8. Drag and drop other fields that you want to include in the report.
9. Click Run Report.
10. Save the report.