I dont believe there was ever a way to copy anything like that in smart console, but, you can copy the config from show configuration file, just do bits and pieces and make sure interfaces names match,
Btw, what some people do is this, mind you, this usually works if you have exact same mode. Say on existing fw, from expert, run clish -c "show configuration" > /var/log/config.txt
Get the file, copy to new box (whichever dir, say same /var/log) and then in clish, run load configuration /var/logconfig.txt
Now, important note here...If you do this, unless you are 100% sure you want exact config copied, you can do below first:
quantum-firewall> set clienv on-failure continue
quantum-firewall> save config
quantum-firewall>
Cheers,
Andy