Creation of Eligibility profiles using CSV or User defined table

Summary:

Hi Everyone,

We have a new type of Performance Document where the eligibility profile is quite complex.
Alternatively we are looking into getting the person numbers for the eligible employees from HR and creating eligibility profile using a CSV or create a user defined table and use a Fast Formula.

I've seen some older posts about both options but I could use some more guidance. I couldn't find examples online(template for the CSV or some details on how to create the user defined table for this specific reason)

Many thanks in advance,
Balazs