At my company, we are transitioning (fully) from ClearCase UCM to Git. We will not be using Clearcase after some time using Git.
In the transition, are there any go
I would not retire clear case immediately. What you want to do is commit the tips of any branches in clear case and any tags. This should be done in a fashion that mirrors what happened in clear case (preserve logical branch points, etc). Use git from that point on. Refer to clear case if you need to dig into history. Eventually archive clear case and only restore it if you are in a bind to see some old commits. Importing old history is not worth the trouble in my experience. It is often very time consuming and error prone.