Org-level reporting
If you have access to multiple ad accounts for an org, you can perform org-level reporting. Org-level reporting combines data from multiple ad accounts into a single report.
Org-level reporting is done using Explore. To access Explore, click 
> Explore from here on any metric tile.
See Custom queries for complete information about using the Explore screen.
Once Explore is open, complete the following steps:
Open the Filter pane.
In the Reporting Ad Account Name field, select all of the ad accounts you want to include in your report.
Adjust filters, data, and visualization settings as needed.
Click Run.
If desired, save the query as a custom dashboard.