How to associate seperate fields in a Entry Form

Hey, for my company we'd like to track Certifications for Entry forms such as Employees, Vendors/Partners, and possibly Customers

I'd like to create a separate tab for 'Certifications' within the forms

I know how to create a tab and a list for certifications , but how could I create columns that you'd enter unique dates (certified/expiration) associated uniquely with each certification chosen on list?

Somewhat like adding items on opportunity / sales orders / purchase orders but for Employees and Vendors