Resource Editing of Guests.

The resources (cores) of a deployed guest in a vcmp system need to be changed. One of the ways I think can be to take the backup config of the guest, delete the guest, create it again, change the cores and then load the backup config on it. Could there be other way like set the guest in PROVISION state and then change the settings. In the latter case, when the guest is set to DEPLOY state, it would pick the config itself ? and would have the earlier HD assigned to itself ?