In this document, you will find the process of overriding specific features on a unit level.
Navigate to the Cogwheel and select Units > Units.
From the list, select the unit you desire to change.
Select Overrides. Here, you are now able to adjust the Rate Code, Tax Code, Deposit Policy, Conformation Policy, and the Allowed Rig Types for this unit only.
When all changes have been made, be sure to save!