The product
Measure a drawing, get a bill of quantities, and — when you need it — quote and invoice from the same place.
product.chain
The end-to-end story, TAKEOFF AND BOQ FIRST, commercial documents LAST (P20-M §0.2 reordered this). One screen per step, each linking to its sub-page.
product.screenshots
OWNER-SUPPLIED annotated screenshots for each step.