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Right-click the section you'd like to copy and select
 Move or copy or press Ctrl+Alt+M. -
In the dialog box that appears, choose the notebook and position where you'd like the section to appear, and then select Copy.
Copying a section isn't currently possible in OneNote for the web. You can copy a page, or you can copy a section in the OneNote desktop app.
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To open the desktop app, at the top of the ribbon, select Editing > Open in Desktop App.
Don't have the app? Get it for free in the Microsoft Store.
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Control-click the section tab and and select Copy Section To.
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In the Copy Section dialog box, choose the notebook and position where you'd like the section to appear, and then select Copy.