Basically, you can create a single reservation first. Then add another reservation into it to make it a Master Reservation.

For example, suppose you would like to create a Master Reservation that contains a Junior Suite and a Luxury Suite.

First, click the New Reservation button and create a single reservation for a Junior Suite.

After the reservation is saved into the system, click on the Add Reservation to add a new Reservation into the current reservation. The current reservation will be converted to a Master Reservation and a Master Reservation ID will be generated and linked to both the current and the newly added reservation.