Answer 'what would this part cost if …' on a calculation that is already priced: name the factors to move, and optionally a different lot size, and read back the whole itemised cost sheet plus the change per cost category. It is FREE — it consumes none of the organization's included calculations — and it WRITES NOTHING: no new calculation, no change to this one, no change to the costing environment. The part is genuinely re-priced through the same engine, so the answer is a price and not an estimate. Use it to search the factor space: read the bands with arcnm_cost_factors, move one factor at a time to learn what each is worth, then combine the ones that pay. Adjustments are checked against each factor's band first, and a request that cannot be answered exactly is refused by name rather than answered approximately. To make a change stick, save it afterwards through the endpoint the factor's edit_path names. Read-only.