Import Sales Orders with Minimum Usage

We are working on creating Sales Orders that include Subscription items.

Our requirement is that each order should capture both the Usage charge and the corresponding ‘Contract Minimum’ value.

(This refers to the attribute that governs usage uploaded on the subscription and is also used for True Up calculations.)

Screenshot from Vision instance with the field

Has anyone successfully implemented this functionality? If so, could you please share your approach or any best practices you followed?