Allocating costs in a mixed-model container needs a single primary record. Use the vehicle dimensions and occupied space to establish the baseline, and keep the securing, loading/unloading and insurance and the per-VIN cost records in sync. Allocate the logistics fee by occupied space, securing and insurance needs, and write the allocation result back into each VIN's landed cost. The records must trace back to the vehicle dimensions and occupied space and the securing, loading/unloading and insurance; when the per-VIN cost records change, revise the documents first, then decide whether to proceed.
When building the master sheet, see How should importers handle configuration changes after signing a purchase contract?. Container cost estimates should state the quote date and exclusions; actual costs follow the contract, invoices and local confirmations.

