After initial contact is done via sg-reconfigure wizard on command line, rest of the configuration is done via SMC. We don't have option to configure devices via command line. Since the NGFW is running on linux OS, majority of the normal linux commands are there, but e.g. ip address command is not meant to be used to making permanent configuration changes. In some cases you might use it to add IP to interface manually or use ip route to add temporary route e.g. to restore the management connection, but to permanently change network and any other NGFW configuration, you need to make changes in SMC and then install the policy via SMC.
Thank for your help. Really miss the command line . Hope that Mcafee will support command line in the future.