Yes of course Folders are the go. Not sure how Sonar folders work but a group of tracks can be selected and a folder created for them.
Tracks outside folders can be easily dragged into them. Likewise tracks inside a folder can be dragged out. A folder can be muted and soled just like a track. Folders can be coloured the same as tracks or a different colour to the tracks.
They are great for making a huge mix look much more manageable.