In the Reservation List page, each Master Reservation has a Master ID shown in the first column.

Searching: You can search a reservation by its Master ID, Child ReservationID, the Guest Name, or Email.

Sorting: When you sort the reservation list, all Child Reservations that belong to the same Master Reservation will be shown together. If you sort the list by Check-In Date, the Master Reservation will be sorted by the earliest check-in date of all of its Child Reservations. If sorted by Check-Out Date, the Master Reservation will be sorted by the latest check-out date of all of its Child Reservations.