Zone:

Zones are used to manage devices in specific locations in a house or building, they can be referred to as rooms or areas. The ‘Zone' function is designed to enable the user arrange devices into areas, so for example devices in a kitchen, bedroom or any other part of the building can be assigned to a zone called ‘kitchen', ‘bedroom' etc.

A 'Zone' can be easily be made by clicking on 'Create New...' after click on the 'Zone' tab.