This article explains how to create audiobooks with chapters from MP3s in iTunes, and how to revert changes in Windows or Mac.
Tutorial | Create audiobook from MP3 on iPhone & iTunes
If you have a series of recordings or ripped tracks from an audiobook on CD and want to merge them into an audiobook, iTunes gives you the ability to do so.
Some media players allow you to use the built-in bookmarking feature of audiobooks, so you can keep listening to a book even if it takes you hours to finish it.
Follow these simple steps to learn how to use iTunes to merge multiple audio files to create an audiobook with chapters: