I’m not really sure about your questions here, but I’ll give it a try. Vegas has unlimited audio and video tracks, each of which can be edited individually.
The manual is really the help files that are included. Most everything I’ve needed to find I’ve found in there using simple search features. The same goes for Sound Forge.
You can get the full Vegas manual in PDF form by going (in Vegas) to Help>Sony on the Web>Vegas Software Homepage -- then choose "Manuals" from the "Downloads" menu at the top.
If by "tracks" you mean individual audio clips, you can edit them, yes, but not in real-time.