The question: if we make this many, what will we need — and what are we short? Give the enquiry a product and a production quantity — in the product's own unit, or by weight or volume where the products declare them — and it walks the BOM through every level to the bought-in components, stating for each: the quantity required (scrap included), its standard cost, and whether the chosen branch's stock covers it.
Run it before releasing a work order: it is the difference between discovering a shortage at the planning desk and discovering it at the stores counter with a released order already gathering WIP.