When you detach a server keep in mind that when you want to reattach it, you need to chose which Ssrver has the project you want to keep.
                          Which means that you can't make modification on 2 separate machines and keep both of the changes.
      
                          To detach a server from the topology you can click on the 
                    
                      Enable live Sync
                     button or right click on a server and 
                    
                      Disable Smode-Net Live-link
                     
                    
                          To re-sync a detached server you can click again on the 
                    
                      Enable live Sync
                     button or right click on the server and 
                    
                      Enable Smode-Net Live-link
                    
                          this will bring a popup asking you to chose the server that is the reference