The landed cost feature in Odoo allows to include additional costs (shipment, insurance, customs duties, etc.) into the cost of the product.
Landed costs can only be applied to products with a FIFO costing method and an automated inventory valuation (which requires the accounting application to be installed).
First, you need to activate the landed costs feature in.
Add costs to products
Go inand click on the Create button. You then have to select the transfers on which you want to attribute additional costs and the costs lines you want to add up. Once it's done, click on the Compute button to see how the costs lines will be split accross your transfers lines.
To confirm, click on the Validate button.