One Dataset Many Reports (Powerbi Desktop Can't Be Used?)

lprbi I don't know if I completely understand the question, but I'll give it a shot by describing how things work.

The desktop allows you to Model and Build Report Pages. Regard each individual Desktop file as it's own report. The Service allows you to connect to a dataset, build reports and share.

If you need multiple versions of a report you could,

Start by using the Desktop, create the report pages, and publish/load the PBIX file to the Service. This will push up the PBIX file as the dataset, and create a report from what you've built in the Desktop. You can then build a dashboard and share the dashboard to end users. You could also create an Organizational Content Pack to Share.

Then if you need additional reports off that same data set you could create a new report off the PBIX dataset in the Service (Click the elipses by the DataSet name and "Explore"). This option would only create the report in the Service though.

Another Option is:

If you've built a model in a PBIX file and you want to re-use the datamodel you've built, just open the file and "Save As" a different file name. Then create your limited reports, deploy that, and create a dashboard to share.

Challenges: You can't copy a page from one PBIX file to another, so you'll need to build the report visuals again.