At the bottom of the Dynamic Template Designer window, click Define Scope Selector.

In the Scope Selector Components window, check Group By.

This setting must be selected so that the data can be grouped rather than enumerated for every time value. When the user runs this report template, a Group By selector will be available to choose the time grouping: Hours, Days, Weeks, Months, Quarters, or Years.

Click OK to return to the main Dynamic Template Designer window.