Upload Audiobook to Audible

GOAL:  Import or Upload an audiobook from a CD or MP3 to the Audible App.

STEPS

1. Create an iTunes playlist called "Audiobooks"
2. When syncing your iPhone to your computer:
• Inside of the sync settings > under Book:Audiobooks
• Select checkbox to sync books from that "Audiobooks" playlist
• When iPhone is synced, the audiobooks transfer from your computer to your phone
3. A new iTunes tab now automatically pops up in the "Audible" app

Reference