To help you stay organized, you can create subpages by indenting pages in OneNote on your iPad or iPhone. You'll need to have a least two pages in the section before you can make one a subpage.
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Tap Edit at the top of the list of pages.
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Tap the page you'd like to indent as a subpage.
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Tap the right indent icon at the bottom of the page list.
The page will become indented, and will be a subpage of the page above.
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To outdent the page, tap the left outdent button at the bottom of the page list.
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Tap Done at the top of the page lists when you're finished editing the pages.
Note: Once you have indented pages to create subpages, you cannot currently collapse in order to hide subpages.