I find that it is best to build the song "unfolded". This means setting the number of choruses to 1, and intially seeting the number of bars to 200 or so. The actual number isn't important as you can fix it later.

The next thing is to determine where the song starts - this is often bar 5, but not always. Then where does the first ending start, and how long is it. This information all goes into the drop-down list is Repeats/Codas etc.

You might also find that you can use repeats, rather than endings.

The thing to remember is that this as a PRINT function and does not affect the flow of the song. BIAB plays the unfolded song, whether you have the repeats or endings correct or not.

The DS-Coda works if you want to jump from somewhere in the song to get to a specific set of bars at the end. (remember in the unfolded song, the coda will always be at the end)

If the coda is really just a different ending, you don't need a DS-Coda at all. I also often have the song just drop through the last ending (or repeat) to add the final bars that I need.

For the most part, it does work if you remember all of the fake book stuff is just a print function. BIAB plays the bars in a linear manner, and not based on your 'printed' presentation.

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