If you no longer need a security group in Microsoft Project Server 2010, you can delete it. Before you delete a group, ensure that no other users or groups are dependent on it for required permissions.
Before you perform this procedure, confirm that:
You have access to Project Server 2010 through the Microsoft Project Web App site.
Important: The Manage users and groups global permission in Project Server 2010 is required to complete this procedure.
To delete a security group
Perform the following procedure to delete a group in Project Server 2010.
Important: We highly recommend not deleting the default Project Server 2010 groups. The Team Members group cannot be deleted.
Delete a custom group:
On the Project Web App home page, in the Quick Launch, click Server Settings.
On the Server Settings page, in the Security section, click Manage Groups.
On the Manage Groups page, in the Group Name list, find the group you want to delete. Select the check box next to the group that you want to delete. Note that you can select multiple groups.
Click Delete Group.
A message box appears, asking for confirmation and noting that the group will be permanently removed. Click OK to delete the group.
Note: Security groups are permanently deleted, unlike deactivated user accounts (which can be reactivated). If you delete a security group and then find that you want to have it again, you must recreate it.