To: pfletch101
MP3 audiobook is a set of MP3 files (.mp3) and playlist file (.m3u). You already have a set of ready MP3 files, where each file is a separate chapter. You don't need an additional splitting. So you can simply create a playlist manually.
Suppose, your book is called "Title" and MP3 files are Title01.mp3, Title02.mp3, Title03.mp3. Create new folder with name "Title" and move your MP3 files there. Then run Notepad and in new TXT file write the names of your MP3 files:
Title01.mp3
Title02.mp3
Title03.mp3
Save this TXT file, rename it to Title.m3u and move it into the "Title" folder with MP3 files.
Your MP3 audiobook is ready!
In the future we will try to add one more mode of creating MP3 audiobooks — for your case.