When building a menu (virtual receptionist) under main number, there is an option for 'advanced callflow'. How do I populate that with a callflow built via callflow app? Or is an advanced callflow something else?

I am trying to route an option with the main number menu to another (sub) menu

btracht00: update the options for the callflow where you "edit callflow name" and tick the box: `List this callflow in Main Number`... it should then be available via SmartPBX for routing from Main Number.