Allows creation of groups within groups

• only members of the parent group can join a sub-group
• sub-groups are fully qualified groups in their own right, may have sub-groups of their own
• infinite depth of sub-groups
• breadcrumb navigation on group pages shows path from parent to current group
• groups owner block contains link to parent group
• groups owner block contains link to subgroups
• when users leave a parent group, they are removed from all subgroups

Creating a subgroup

• subgroup automatically inherits colors/backgrounds from parent if group custom layout is used

Deletion of a group

• if the group has subgroups, all subgroups will be deleted
• content within subgroups can be reassigned to the original owner, to the parent group, or deleted

Updating a group/subgroup

• if the visibility of the group becomes more restrictive, any subgroups contained by the group will be updated to the more restrictive visibility.