I think he's saying he's doing it outside MB in Audacity.
I got that, but he said yes when I asked if he was using Renumber Tracks, only to mention Audacity. Seems to be a miscommunication there.
OK, I tried Renumber Tracks. Highlighted an album with 20 tracks in it, not in alphabetical order. Clicked on Renumber Tracks and the list of songs went into it, numbered it's true but still not in alphabetical order. Can't find any way of changing the numbers the way I want it. So that is why I use Audacity to number the tracks manually, then put them into MusicBee. So far it works though time-consuming. I've been all over the various controls in MusicBee to find a way of automatically alphabeticalising my album tracks but nothing. At least it gives me something to do during this virus lockdown!!