iBooks Author: section
A section is a part of a chapter. You can use sections to divide up your chapter. For example, a book about mammals could have a chapter called “Bears,” which could contain sections such as “Polar Bears,” “Grizzly Bears,” and so on. You can also use sections for self-contained content within a chapter, such as lessons, activities, or case studies. Sections are numbered independently of chapters. If a chapter uses sections, you can include standalone pages before the first section, but not between or after sections.
Each template contains several chapter and section layouts that you can customize. There are also sections preformatted for copyright, dedication, and foreword information.