I use Peter's reasoning.

I always set my song to one big "chorus".
I always have the "Bar Lyrics" layer turned on, which I use (if I don't need lyrics) to make note
of "Verse" ("a" substyle - blue) and "Chorus" ("b" substyle - green).
If I need additional substyles, say for "Intro", "Bridge", "Instrumental", "Extro" etc.,
it's now a simple matter of just right clicking an existing bar number,
hit the "Define substyle" selection, and you can make any required additional substyles.

If I need to create a piece for printout, I save my BIAB file with a suffix to the name
and do any mods to make it look right on that file.

In short, I just ignore the whole "chorus" concept.
YMMV
LLOYD S