In your environment you have multiple groups to create assignments of an app or a configuration profile. If you later realize it would be better if this was not a device group but a user group, it is hard to change this without the user having an impact or you have big efforts. I have written a script that you can convert a user group into a device group or a device group into a user group based on the user assigned to a device or based on the devices assigned to the user.
