Ability to clone device group & sub-groups

Please, for the love of all things good in the universe, add an option to clone a device group and its sub-groups.  The clone option should clone only the device group hierarchy and all properties and collector preferences, but not any devices linked to the groups.  We have a device group hierarchy that we use for some services, and each time we add a new service it would save a great deal of time if we could clone an existing hierarchy.