LCM- Multi Vendor Shipment Landed cost - Pre-Receiving Flow

 We are implementing LCM as pre-receiving application for a client which make lot of procurement from multiple vendors from overseas. They have engaged their own Freight Carrier to complete shipment from these multiple vendors so each shipment container may include PO item lines from different vendors. We are having difficulty in mapping AP Invoice scenario in this case so I have tried to summarize the following example to it easier for community experts to provide us some guidance:-

Pl explain how the actual landed cost would be calculated in case of following businss scenario:-

PO# 1 Item A Qty 100 unit price 10 item weight 1.2 lb, Supplier - ABC