To delete a group or subgroup
Remember, when you delete a group or subgroup, members of the group lose the roles assigned to that group, and any parents of that group also lose those role assignments, unless the roles are also explicitly assigned to the parents.
1.
Click Settings > User Groups.
The Group Hierarchy list is displayed in the left pane.
2.
The group detail page displays.
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3.
Click the Delete Group button at the top of the right pane.
A window displays the message, Are you sure you want to delete this group and all of its subgroups.
4.
The group is deleted and the group name is removed from the group hierarchy list, along with its subgroups, if any.