You can add any additional cost to a PO using the “Additional Cost” feature.
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To do this, open the PO you want to update, click on Insert Costs. Start typing the name of the cost, and it will be added to the PO as well as included in the PO export.
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Extra Costs are distributed proportionally based on the quantity ordered.
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To Simplify...
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​Unit cost: Unit cost per unit
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Landed cost: Unit cost per unit, including extra costs due to shipping/extras/discounts, etc. (as defined in POs). If there are no extra costs, then same as the Unit cost
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COGS: Unit cost × units sold
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Landed COGS: Landed cost × units sold. If there are no extra PO costs, then same as COGS