I am not sure if you have your song in "linear" form, but that is the best place to start.

Right click on any bar brings up the repeats menu. From there you layout the song.

Remember repeats and endins are oly a print function, and they do not affect how the song plays.

When you are ready, or have at least got some pieces in place, save the song and go to the fake sheet screen - the little green button with the eighth notes.

You should start to see you song coming together. Don't worry yet about new lines, as we get to this later. Just get the endings in the proper place. I like to use 4 bar endings, starting on a new line.

If you have to mske changes, and you will, right click on any bar and click the edit list button. This brings up the existing list of repeats. You can have several entries here. For instance, a repeat starting on bar 5 with the first ending startin on 21 for 4 bars, and a ds al coda returng to bar 5 and jumpng out at bar 16.

Get all of this right first.

To get the print to start on a new line you need to go to the OPT button in fake sheet. Towards the lower left is a box that allows you to define how many bars you want on each line. By setting this correctly the song prints the way you want. Just put the number of bars per line follwed by a comma. (Eg 4,6,6,4,4,3,4)

If you need to edit this, you have to reenter it all again.

With patience and practice you can get a reasonable print. By the way, put your part markers where ever you want, the do not affevt the fake sheet.

BIAB for Windows Version 2019 (643)
Windows 10 (1909)