User Groups pricing options by variant

I am needing to be able to input custom pricing per variant for different User Groups.

We have multiple Dealer user groups setup which our client provides different pricing to their dealers.

We have this working for the base price using the Quantity Discounts tab, but we need it further detailed by variant. Does anyone have any idea where I can start to make this happen. We are using 2.0.15, if we need to update that is a possibility.

I need this too, is there a mod for that?