Support Booking.com's Multi-Unit Feature

Booking.com users with properties that have several rooms in them (like a building or a hotel) are unable to connect all of them at once. If they have, for example, 10 rooms of one type and 5 of another, they are connected to iGMS as just one room of each type, so only 2 rooms appear. Please offer better support for Booking.com’s multi-unit.