You can add any additional cost to PO using the "Additional Cost" feature.

Simply start typing the name of the cost and it will be added to your PO and Export of the PO.

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

​Landed cost: unit cost per unit, including extra costs due to shipping/extras/discounts, etc (as defined in POs). If no extra costs, then same as the Unit cost

​COGS: unit cost * units sold

​Landed COGS: landed cost * units sold. If no extra PO costs, then same as COGS