As you may know, the answers to your questions can be found in Help in fairly good detail. Here's what I do:

If I have trouble with repeats, I just use unfold to one big chorus. It's a choice in the Edit menu.

There's a box right on the main screen where it shows the key. Let's say the concert key is in C and you want a Bb part. Just change the key to D, go to the Notation screen, and click print. You can make some changes in appearance there. I usually put in which part it is in the composer block. When you are done printing, go back to the chords screen and click undo transpose in the edit menu. Just repeat the process for whatever key you need.

I've never tried to print just part of a song, but maybe you could do that by using the Soloist track. Maybe someone else will jump in here for that.

Remember that you are not locked into just one file. You can change the melody and/or soloist and save the song each time you make changes. When you are satisfied that you have what you need, you can go back and delete any extra files.

Stan

Cornet Curmudgeon