A device group enables you to easily deploy common configurations across all the devices of the group using templates. You can create device groups based on your requirement, for example: geographical location, business function and so on.
A device group can be created only at Tenant level.
To create a device group

Select devices listed in Unassigned Devices to add to the group being created and click caret-right icon.
The devices are moved to Grouped Devices list.
Click Save.
The Migrate Devices pop-up window displays.
During migration, devices will be updated with configuration inherited from the new group.
Enable Auto Commit & Deploy Templates to commit the changes inherited from parent group and templates into NSM and deployed automatically to the migrated firewalls.
Click Save.
The newly created group is listed under the default group—.
To create a device group under another device group
The newly created group is added under the selected parent group. Click the caret icon next to the parent group to view the newly added group.