Landed cost is the extra expense of a product at the time of purchasing. One can sale the product with landed cost and can split this cost in different ways. Create two product must be inventory valuation is automated and costing method in FIFO. Here we want to enable landed cost in inventory so go to Inventory Configuration - landed cost - enable it. Then create a purchase order for these two products and receive the quantity. Then comes to operation - landed cost create a new landed cost. Here one can see a column for specifying the corresponding transfers. Copy and Paste the reference of the transfer to this column. Add the service product and press compute button.