HP Data Protector 8 CLI & VMware

I'm trying to create VMware machines backups using only CLI in DP 8.0.

I've got vCenter as a Client and created Backup Specification including some of the virtual machines.

Running this BS is quite easy, using omnib tool.

Later on, another VM is created, so I'd like to include it in this Backup Specification - how to achieve this goal using only CLI?

thanks