I know how to configure samba on my ubuntu box to become a PDC however I need some select files to be accessible to multiple users. These files are beyond their personal files.

I.E. users A-C need to be able to access a schedule saved as a spreadsheet. But user D does not and users B-D need to be able to access confidential employee info but user A does not. How do I set this up on top of the PDC structure?

Any video tutorials would be a plus. Im new to linux so documentation is a confusing slow slog to learn.

Thanks so much in advance!