Skill Based Pay with Multiple Rates of Pay

Summary

Need multiple rates of pay to support skill based pay initiative

Content

We are looking to roll out a "you do you get" skill based pay model for some of our field employees.  In order to do this the way it is proposed, we would technically need 2-3 different rates of pay.  For example, we'd need their base hourly rate, their skill pay rate, and if those two combined are less than their current annual salary, then a grandfathered rate in addition.  We also need to be able to add $ to the skill based pay rate through an API or integration.  (i.e. if my current skill rate is $12/hr and I