Hello Mohamed,
As a first step you have to make sure that you have the two SNC components on the client workstation before to migrate the server configuration.
Here in this blog you will be able to find some details: SNC Product Migration: Now is the time
For changing the SNC names you can use for example the transaction SNC1 to re-create the names and then transaction SNC4 to enable a new canonical name.
Regards,
Donka Dimitrova