Is there a way to have Learning Sub-Topics to group similar learnings together within a Category.

We are using Category Communities to target audiences - i.e. New Hires, Managers, Leaders, Search by Topic. We have 8 major topics assigned by our content provider (Business Skills, DEI, Leadership, etc.) but would like to have sub-topics (DEI: Unconscious Bias; Business Skills: Communication, etc.) to further categorize courses. Is it possible to have a Topic Community assigned to a Topic Community? Or another way to accomplish this?