Go to Cards > Service Management > Service Manager.
From the Service Manager menu bar, go to Additional > BOB Site Tracking Setup.
Excerpt
Buttons on this window
Cancel - Closes the window without making any changes.
Unlink - Removes the link to the entity. If you are unlinking a Client, this will also unlink all associated Sites, Technicians, Equipment, and Contacts. If you are unlinking a Site, this will also unlink Equipment and Technicians.