A new opening configuration should not become an exception hidden in a spreadsheet. Before improvising, describe its composition, verify materials and record the rules so the team can repeat the calculation.
Describe how it works
Record opening type, panels, fixed sections, divisions, dimensions and finish. The name matters, but the structure guides calculations.
Validate components and cost
List profiles, hardware and glass. Check that prices match the configuration. Separate assumptions from what has already been approved for production.
Turn exceptions into library entries
If the solution is used again, register it with a clear name, revision and owner. An evolving library reduces dependence on individual knowledge.