If you have an accommodation that is rented out in separate subunits (e.g. rooms), you will first need to create the main listing, using By Room Layout.
This refers to the details of the complex, hotel, guesthouse that includes the sub units or secondary listings (rooms, apartments, tents, etc.).
Once you have created the main listing and completed the Content | Location | Attributes sections, you will need to go to the Rooms Manager to define the secondary listings.
Later on, you will need to go to Rooms Availability to update the calendars.