Once a new book is created click on the edit link next to the title of the new book on your Profile page to open the book's Editing page.
Inside the the Chapters tab, the page is divided into two areas, the top area is the Table of contents and the bottom area is called Hold chapters. Any chapter residing in Hold Chapters will not be visible in you books Reading page and will not be included when you publish your book (e.g. creating a book or web formatted pdf, or epub).
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