Hello Siva,
I did a little testing and unless you plan on keeping the same IP Phone as the user is currently using I do not see a way to do this.
If they are keeping the same IP Phone, you can try a Bulk Admin Export and then Import into the new system but you will have to make some modifications to the .txt/.xls that is generated to match device pool settings etc of the new cluster.
Hope this helps,
John
