That's the exact question I asked myself recently.
You see, The Biz Plan Book is now in it's 3rd year and those who use it LOVE IT. Right after the first Biz Plan Book got released, The Bullet Journal system came out and I became obsessed.
I struggled for two years with my love of both systems, the powerful workbook portion of The Biz Plan Book and the flexibleness of The Bullet Journal. I wanted to be able to combine the two, so I worked on many different on how they could work together.
I've recreated the Biz Plan Book inside my Bullet Journal.
I've recreated the Bullet Journal system inside of The Biz Plan Book and the only part that really worked was the list of to-dos.