Moving the snapshot data to a new Protection Domain?

Unfortunately no on the moving. I have found no way to move snapshot data. The easiest way would be to deactivate and remove all schedules from the old PD and create a new one. You will have to remove all virtual machines from the old PD and add them to the new one. You will not lose existing snapshots if you do that. You can let the old PD snapshots age off or delete them locally and in the remote locations, if you have that configured.