Managing a car order paid in stages means re-verifying against the exact version. If the conditions at each payment milestone, the exchange rate and price adjustment rules, or the inspection, shipment and document evidence rely on generic material, the conclusion can't be trusted. Tie each payment to a verifiable milestone such as a passed inspection, a confirmed booking or approved document drafts, and make exchange rate adjustments correspond to specific milestones too. List the conditions at each payment milestone on the batch checklist and keep the original material for the exchange rate and price adjustment rules; re-check everything when the inspection, shipment or document evidence changes. When finished, have the person responsible for staged car payment risk sign off, record the date of the documents used, and note any exceptions that must be cleared before the next step.
For version differences, see also After comparing two Chinese SUVs, how should an importer decide which one to stock first?. Estimates tied to staged payments should note the quote date and exclusions; actual costs follow the contract, invoices and local confirmations.