How do I automate pricing/markup items on an intercompany order whilst adding to inventory value?

I want to markup an intercompany order, so it has to start with the PO and then run through manage intercompany sales orders to generate a paired intercompany SO.

I also want the items to take on the value and not have the markup as a separate single line item. It is important the items carry the added value as we track them as assets and the markup is inclusive of that value.

Currently I can only find information on adding markup as a line item or perhaps by setting a price group. But I don't think price groups work because those are for customers and intercompany orders need to start as a PO from the customer sub to the vendor sub.