Remove a Team Project Group
If you have a project 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.
If you remove a team project group from Team Foundation Server, you do not automatically remove any groups that support this project in SQL Server Reporting Services or SharePoint Products. You must manually remove any such groups from those products.
To perform this procedure, you must be a member of the Project Administrators group or your Edit Project-Level Information permission must be set to Allow. For more information about permissions, see Team Foundation Server Permissions.
To remove a team project group
In Team Explorer, select the team project that the group is in.
On the Team menu, point to Team Project Settings, and then click Group Membership.
In the Project Group Membership dialog box, select the group you want to remove, and then click Remove.
In the delete confirmation dialog box, click Yes.
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 Scoping a Field Rule to a Group. 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.