A holiday house consist of 2 apartments (apartment A and apartment B) which are rented together and individually. Apartment B consists of 3 rooms which are also rented separately.
To set this up you will need 6 rooms in {{#fas:cog}} (SETTINGS) PROPERTIES > ROOMS.
*House
*Room 3
Go to S{{#fas:cog}} (SETTINGS) PROPERTIES > ROOMS > DEPENDENCIES and set:
*Rooms: set ""Include Bookings from" = House