When you delete a hierarchy, the nodes within the hierarchy are not deleted. If the nodes do not exist in any other hierarchy within the version, then they become orphans. Click the Orphans tab to view the list of orphans.
To delete a hierarchy:
From Browse, select a version.
Select a hierarchy.
Select Hierarchies, then Delete.
Click OK to confirm the deletion.
When the version tree refreshes, the hierarchy is no longer displayed.