You can use the vzmigrate utility for moving a VPS from one server to
another. Here is an example of moving VPS #101 to hardware node
192.168.0.1:
vzmigrate -r no 192.168.0.1 101
If VPS #101 already exists on the destination node, you can assign new ID to a VPS using:
vzmigrate -r no 192.168.0.1 101:102
The same can be also done using the Virtuozzo Management Console.