Learn how to change chapter levels in your ebook.

Change a Chapter's Level

  1. Select the chapter or subchapter that you want to move to a new parent.
  2. Click on the drop-down box at the bottom left corner of the chapter menu.  
  3. Select the new parent chapter. Root will make it a top-level parent chapter.

And then you're done.

If you haven't already, read Chapters and Pages in Ebooks to understand chapters in EPUB .