Key Points
- Use Product costs to preview and apply bulk cost rows; invalid rows are not silently applied.
- Use Shipping setup to replace a rule-based estimate with the exact cost for a supported order.
- An exact order cost takes priority over a matching shipping rule; a rule can supply an estimate when no exact cost exists.
- The previous result remains labelled while recalculation is pending. Reopen the affected day after the current recalculation completes.