SONAR ships with a normal.cwt (the default project template) which has a predefined master bus. It is possible to designate any bus as the master by right-clicking the bus and selecting "Set as Default Bus." Any tracks added after setting the default bus will be have their output set to the bus. To change existing tracks to the bus, select the tracks, hold the CTRL key and set the output in one of the selected tracks.
It is also possible to quick group track faders and make adjustments by selecting the tracks and holding the CTRL key while adjusting one of the selected faders. Also faders can be grouped by right-clicking the faders and assigning them to a group.