Sorry for such a basic question, but where in the manual / among the many tutorial videos can I find the boiled-down basics on how to tell BIAB which parts I want to play when?

I would like to find a hopefully easy way to select my parts and then tell BIAB, "Ok, play drums throughout; play the lead only in measures 14-18; play the bass in all measures except 20-27" etc. For simplicity's sake, let's say I am not using the melodist or solo features, rather just adding tracks using the stylepicker.

And after typing chords in, how can I designate where choruses start and end?

I am not asking for someone to write a primer on these things for me, rather I am just looking for a steer on where in the documentation I should look to focus on the ins and outs of this topic.

Searching through the giant manual is a bit tough as I guess I don't know which specialized vocabulary to search for, and nothing is jumping out at me from the Table of contents. (Admittedly I am using a laptop with a small screen and no external monitor here on vacation; this makes searching the the PDF feel a bit more "cramped" and daunting than usual; and of course you can't search videos).

I'd be really grateful for any help.

http://www.youtube.com/watch?v=3tDj_VanH3g