Reporting on multiple groups

I have a community that is used globally by different countries. For example community.com/au, community.com/us, community.com/de (they are each sub-groups from the home group). Within Reporting for the Australia team, we are having trouble viewing only content within the Australian subgroup tree.

Is there a way to add filters or even group a bunch of sub groups together to view the reports with only the information from a certain country/ URL prefix?