According to the song arrangement, the very beginning may not be the first Bar of the song for the ACW's analysis. The first bar should accurately be the first bar.

The bar lines once you set them can and should be corrected by eye, sound and the WAV form to be as accurate as possible when they've been entered manually. That said, they don't have to be exactly accurate to provide an accurate Chord analysis and overall tempo. As you noted, if you are only using the audio imported track for analysis, use it for the overall tempo and chord analysis, original key signature and feel of the song and possibly assisting in auditioning and selecting an appropriate style, once you've used the audio file for what's needed to accomplish the goals you need and discard the audio, you can adjust, modify and change styles, tempos, chords, key signature and feel to suit your own cover of the song.

Forum member Henry Clarke has an excellent tutorial to how he uses the ACW to analyze and create covers, many of them Motown songs. His video should be helpful to you.

How I use the Audio Chord Wizard in BIAB

BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.