Creating a room
Creating a new room.
Open Rooms
Settings → Configuration → Rooms.
Create a new room
Click New Room, enter a name and confirm with Add.
Add devices
Assign the room its devices, see Assigning a device to a room. To make the room appear in the menu under a zone, assign it to a zone under Zones.
More on this: Create Room and Assign Rooms to a Zone in the integrator handbook.