When you detach a server keep in mind that when you need to reattach you need to chose which Server has the project you want
this to say that you can't make modification on 2 separate machine and keep both of the change
To detach a server form the topology you can click on the
Enable live Sync
button or right click on a server and click
Disable Smode-Net Live-link
to re-sync the 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