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Open a Class Notebook and select the Class Notebook tab.
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Select the Copy to Content Library icon.
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Choose the sections from this Content Library you want to copy, then select Next.
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Choose the destination Class Notebooks for this content and select Copy.
Tip: Select View copied sections to view status updates on sections you’ve distributed to other Class Notebooks. You can close the distribution window at any time and sections will continue distributing in the background.
Source: Microsoft