iBooks Author: Renumber chapters, sections, and pages
Chapters, sections, and pages are numbered automatically. By default, these items are numbered sequentially throughout the entire book, but you can make a section or page start with a specific number.
Change section or page numbers
Select the chapter or section in the Book pane.
In the Layout inspector, click Numbering.
To change how chapters and sections are numbered, click the pop-up menu under Chapter & Section Numbers and choose an option.
Number sections based on their order in the entire book: Choose Relative to Book.
Number sections based on their order in the chapter: Choose Relative to Chapter.
Remove numbering from a chapter or section: Choose None.
To format section and page numbers, select options under Chapter & Sections Numbers or Page Numbers:
Continue numbering from the previous section: Select “Continue numbering.”
Start the section or page with a specific number: Select “Start at” and enter a number.
Change the numbering format: Click the Format pop-up menu and choose an option.