Let's consider a use case: in a Summary report, add the total amount of Open opportunities in the Grand Total level. Assuming that a Roll-Up Summary field in Account from opportunity called Total Amount of Open Opportunities has been created, here are the roll-up summary field details:
- Go to the Reports tab and click on the New Report... button.
- Select the Accounts Report Type and click on the plus sign under the Accounts & Contacts category.
- Click on the Create button to continue.
- Change Show to All accounts.
- Change the Date Field Range to All Time.
- Change the format to Summary and click ...