Hi @Anonymous ,
First, to publish a Power BI paginated report to the Power BI service, you need a Power BI Pro license, or Premium Per User (PPU) license, and write access to a workspace in a Power BI Premium capacity.
There are two ways to add a sub-report.
One is On the Insert ribbon, select the Subreport button, or right-click on the report canvas and select Insert > Subreport.
Another is to select the Browse button > navigate to the report you want to use as the subreport > specify the name of the sub-report in the Name text box.
For more information, you can refer this documentation:
Subreports in Power BI paginated reports - Power BI | Microsoft Learn
Hope this helps you.
Best Regards,
Community Support Team _Yinliw
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