Landed cost calculation in IC transactions

Summary:

Landed cost calculation in IC transactions

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one of my customer wants to calculate Intercompany Transfer Price as shown below:

IC transfer price markup calculated based on “material net cost(vendor price minus IRA rate(tax incentives)) + Landed costs (freight and duties ietc)”. Looks like the customer wants the IC price calculation based on “material net cost (vendor price minus IRA rate) + Landed costs” when they do the buy/sell for the Drop ship IC calculations.
The customer asks the supplier to drop ship the products to thier customer site. But the financial tranasction goes through couple of hops with the subsidiaries.