Shotgun Desktop - Combine submenu

Greetings Everyone,

I'm facing problem here, I tried several times to make multiple version as combine submenu into Shotgun Desktop for specific application "Maya or Nuke etc..." like this screenshot attached below, but unfortunately I can't. Also I couldn't find any of this specific in the documentation.

It would be nice if anyone could guide me to achieve it.

Best regards,

Hassan Youssef