Use iTunes to Convert MP3s to Audiobooks
If you have a series of recordings or ripped tracks from a CD-based audiobook that you want to splice together into an audiobook, iTunes provides the means to do it. Some media players let you use audiobooks’ built-in bookmarking capabilities to follow along with a book that takes hours to finish. Follow these simple steps to learn how iTunes can join multiple audio files together to create an audiobook with chapters: You can find the audiobook iTunes created in the Audiobooks section. Choose it from the drop-down menu.
Double-click the newly made audiobook to start playing it. You should also see that the audiobook has multiple chapters that are the individual tracks that you combined.
Rolling Back Changes
Do this if you want to reverse the above procedure to split your custom audiobook back into its original components: