How to: Remove a Server-Level Group
If you have a server-level group that is no longer being used, you can delete it. Before you delete a group, make sure that no other users or groups depend on the group for required permissions. You can also add or remove permissions for a group, and add or remove members. You cannot remove default server-level groups.
To perform this procedure, you must be a member of the Team Foundation Administrators group. For more information about permissions, see Team Foundation Server Permissions.
To remove a server-level group
In Team Explorer, select the Team Foundation Server that the group is in.
On the Team menu, point to Team Foundation Server Settings, and then click Group Membership.
In the Global Groups dialog box, select the group you want to remove, and then click Remove.
In the delete confirmation dialog box, click Yes, and then click Close.
When you completely remove a user or group from Team Foundation Server, any rules specifically and only for that user or group will also be removed. For more information about rules, see Conditional Field Rule Attributes. Those rules will no longer apply if you re-add that particular user or group. You must re-import the work item type that contains the rule specific to that user or group. For more information about importing work item types, see How to: Import a Work Item Type to an Existing Project.