I really appreciate the tutorials from PG Music but I’m looking for a complete video training program from beginning to advanced. Is anybody aware of such a program?

I don't know of any tutorial series that covers everything Band-in-a-Box can do and all the different ways to do it.

The +++ Groove3 tutorials +++ come close.

I've got the 2015 Band-in-a-Box for Windows Explained and had the 2014 Band-in-a-Box for Mac. Both follow the same format and are pretty extensive.