Hi,

In Odoo, landed costs are normally distributed by methods such as quantity, cost, weight, or volume. This works when shipping costs are proportional to these factors, but in your case, the shipping charge is tied to containers per line, not units. That’s why Odoo’s default allocation does not reflect your real cost structure.

Your requirement is to split the shipping cost by container count: for example, Line 1 with 2 containers should get 6,000 USD, Line 2 with 2 containers gets 4,000 USD, and Line 3 with 1 container gets 2,000 USD. Each share is then divided by the units in that line to compute a per-unit cost. This ensures the calculation reflects actual container-based expenses instead of spreading costs across all units.

There are three possible approaches. First, create a custom landed cost allocation method in Odoo that distributes costs based on containers; this is the most scalable and accurate solution. Second, treat the container as the unit of measure, then use the “By Quantity” method to allocate costs, though this requires dual UoM for per-unit visibility. Third, manually create multiple landed cost records split by container share per line, but this is impractical for large volumes.

The recommended approach is adding a custom “By Container” landed cost method, which integrates smoothly with Odoo’s workflow and avoids heavy manual work while respecting your business logic.

Hope it helps