Hello @philiphotog,
As of the moment, the Add this report to a group function is only available for the Essentials and Plus subscription. But don't worry, you can still see all your customized report under the Custom Reports tab after saving them.
Lastly, here's a few articles you can read for ideas about utilizing your reports and its functions: Reports and Accounting.
Keep me posted in the comments down below if you have any other questions. I'll be happy to help.
