Need Help/Advice for customizing an app

New Contributor
Could anyone please explain to me the best way I could create a local database or “account profiles” for my SPO modern team site that is mean for employee and training management if not all employees have an organizational Microsoft account?

I need to be able to use it for tracking everyone’s leave, training completion, course/event registration, and counseling/mentoring record.

I am the sharepoint site collection administrator
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