How to change Cell Manager name for different clients from command line

Hi workmates,

We have two backup environments, dataprotectorA and dataprotectorB. Both of them are working.

dataprotectorB environment is similar to disaster recovery from dataprotectorA environment, but it has another clients working with online backups.

My doubt is the next:

When my business decides to failover clients are running in dataprotectorA environment to B environment, how could, from command line, to modify the Cell Manager name for the failover clients?

For example, the failover clients are Windows machines running on VM-Ware, and we need to change the cell manager name for "exchange.emea.com" client. This client is in both environments. I know if we modify the regedit, 

HKEY_LOCAL_MACHINE\SOFTWARE\Hewlett-Packard\OpenView\OmniBackII\Site\CellServer, I could change the cell manager name, but I had to connect to the client and this action on 30 clients is slow.

I don´t want to export the client from dataprotectorA environment, because suposse there is a crash on dataprotectorA environment, then the export operation is not possible.

Of course, I've tried to launch the next line from dataprotectorB command line:

[root@dataprotectorB datalists]# omnicc -import_host exchange.emea.com
Cannot import host.
Host already in cell.

But how the client belongs to dataprotectorA environment, I cannot import it to dataprotectorB environment.

I hope I explained well.

Any idea please?

Thanks and regards.