Learn how to add subchapters in your ebook.

Add a subchapter

  1. Click the + add button next to the chapter title.The Layout window will appear.
  2. Select your preferred layout for the new subchapter.
    The new chapter will appear in the left chapter menu as "Untitled Chapter". The title will be highlighted for you to rename it. 
  3. Type in the new chapter title and Press Enter.
    You may also click anywhere on the screen to exit the title textbox and change the title later.

 You've now added a new subchapter to your ebook.

It is possible to continue nesting subchapters infinitely. 

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