Pick the front of room, choose how you'll spec it, set your loyalty tier, and add the supporting cast. The bill of materials totals the room in MSRP and shows which track each line rides — including the one move that changes the math on the soundbar. Your cost sits underneath, at your tier.
Supporting-cast MSRPs vary by config — punch in the number from the dealer portal and it folds into the math. Leave blank to keep it on the build sheet as a to-confirm line.