Component
Derive party size from parameters already collected (usually custom integer inputs) instead of a dedicated person-count UI.
When to use: Tile or RequireInput flows that ask “adults / children” as separate fields, then need a single person-count for occupancy.
Typical place in the funnel: After RequireInput or TileSelectionInput, before UseQuotas / plan-element selection / AddPositionToOrder.
See PersonCountInput and pattern booking-classic-occupancy.