How to modify Transaction cost for a transaction

Summary:

Hi, We have the following requirement. Please help us to achieve the requirement

We have inventory items that are moving between subinventories, for example moving from Raw subinventory to Consumption subinventory. After a few days once the Item is used in Consumption subinventory, and if the business finds the item is in reusable state then they would move the item back to Raw subinventory. When moving the item back to Raw Subinventory, the expectation is to reduce the item cost by 25%. How to achieve this requirement?

Example: 1st Jan, Item Received in Raw subinventory with cost 100$ and Quantity 500

10th Jan → Move 200 quantity from Raw subinventory to Consumption subinventory, This transaction would take cost as 100$