Best Practice for different customer with different overhead rate markup

We are encountering a situation and would like to seek Oracle’s best practice advice.

We are a global company with intercompany transactions, and all our items are shared across all customers. This means the same product items may be shipped to the UK, NA, or Mexico from same inventory org. Due to business requirements, we need to apply standard Overhead rates in costing to cover Invoice Price Variance (IPV) and Freight fees. These overhead rates are regularly reviewed, compared against actual costs, and adjusted as needed.

The IPV and Freight overhead are then transferred into internal transfer TO and DI shipment AR unit prices, along with the product cost. A markup is applied, and the total amount is billed to our customers, following a transaction cost-based transfer pricing rule.