Set how many systems you're re-ducting; each has a name, supply, return, and a consumables fill-in at the end. Multi-floor systems can terminate a duct in a box for that floor. Tick package unit if it uses square-to-rounds (no plenums — one supply duct, one return duct). Boots and Return Filter Grille Boxes have built-in collars. The takeoff breaks out by system, then a grand total.