you can create manual groups by a simple right click in the Device group sectionon All devices folder to create a group
or on the selected group to greate a subgroup
Notes: by a simple right click on a group, you can rename it or delete it
You can also unenroll all devices. please refer to the unenroll section for details about unerollment
You can create upto 7 levels of sub-groups
a device cannot belong to 2 manual groups at the same time