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Create the price grid and enter the amounts as usual
Create a price breakdown
You may create one or several price breakdowns, depending if the external price components amounts should depend on the sales channel or not. This step is exactly the same as for the already existing internal price components.
Select the price components to be used by the price breakdown
You may select internal price components, external price components, or both
You have first to enter the catalog prices. Then, you must create a price grid breakdown
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