Hello everyone!

I am kinda new to this forum so apologies if this might be a repeated thread. Also, I apologize for my bad English.

During the last few days, I've been trying to create a video with a few audio channels to create a surround sound experience. I'm aiming to use the 5.1 Surround Sound, which is the only option that shows for me along with the Stereo one.

I've already edited the audios the way I want, their position on the sound subwoofers and stuff. However I'm not very familiarized with the busses features. Could someone help me with what are they focused on? I am not quite sure how they work.
Also, I try to change one audio Bus and it changes for all tracks. Is it possible to change the busses independently for each track or do they all work together?

Please notice that I am an amateur video editor, I am in no way a professional editor and I may not know a lot of Vegas. Though I use it since circa 2009, I've never tried to use the surround sound and busses ever before.

Thanks in advance for all the help!