4.6x
Configure the pricing procedure at delivery with the required condition type to determine freight. Also have the copying control from delivery to billing at item level with Price source as D for Delivery. While you execute billing you would get the prices from the sales order as well as from deliveries.
If you were to look at the pricing procedure RVAA01 you will see there was a section dedicated to the various freight charges. Normally, I would use one of the available condition types and create a condition master based on the Incoterms.
Configuration path :-
IMG -> Logistics Execution -> Shipping -> Basic Shipping Functions -> Pricing
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