Hi Jun,
Its a corporate decision. Things will move to CM Services then CTS and then ChaRM and hence to a central NWDI and hence the migration and hence the this discussion on migration. 
We understand that to implement CTS+ the same instance if runs NWDI and DEV cannot be configured for CM Services. So we needed some help on the aproach.
Now we are upgrading our central NWDI SLD content to support 7.31 runtime systems. We would create CTS Dev Conf and migration the other Applicatino from local NWDI to central NWDI.
Any lookouts?
Regards,
Varun Biswas