To create and use group types, you must be an administrator or have the permission
Add/Edit Groups set to Allow in at least one of your
responsibilities.
You can delete a group type that you no longer need.
Click Admin > System Settings > General Settings.
Click the Group Types tab.
Point to the Group Type row, then click and
Delete.
If the Group Type is not in use, you will not receive a warning and the
Group Type is removed from the list immediately.
If the Group Type is in use, a message displays alerting you to how many
groups the Group Type is assigned to, and asks for confirmation to
delete.
Once you delete a Group Type it is removed from every group it was
assigned and you will not be able to search on the Group Type
anymore.