All of the top level sections here are called Books. Every book can contain a nearly limitless amount of Pages. A Page is simply an article posted by a user that is bound to a book and placed within its heirarchy. The heirarchy is a standard tree model with your book being the trunk and each page being a potential branch.
To create a new book:
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On the Admin bar, hover over Content Management
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Hover over Create Content
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Click on Book Page
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Fill out the Title field with the name you want the book to have.
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*Optional* Fill in the tags and body.
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Scroll down to the Book Outline section, and click it to open it.
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Under the Book Dropdown menu select, <Create a New Book>
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*Optional* Select a weight, lower numbers cause the book to be listed higher up. (more weight causes the title to sink)
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Click the Save button to complete it, add child pages as you like.
To add pages to a book:
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Navigate to any page within the book, including the top page.
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Scroll down and click on the Add Child Page link near the bottom left.
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Fill in the Title, tags, and Body as needed.
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Click Save to post it.