Not at my DAW right now, but I think if you right click in the bus pane on the track view, you get the option to add a new bus. Add the bus and relabel it Master and route your drum bus or tracks or whatever to it and you now have a master bus.
The master bus isn't anything special. Its a regular bus that is labeled master when you open certain templates. Tracks created will often be automatically routed to it. You will have to manually route your tracks to the master if you recreate it.