From https://confluence.atlassian.com/doc/copy-a-page-139013.html:
To copy a page and all its child pages:
Go to the page and choose > Copy.
Choose a Location for the new pages.
Select Include child pages.
Use the options provided to customize your new page titles.
You can add a prefix, replace a keyword or phrase in existing titles, or both. The preview will give you a good idea of what your new page hierarchy will look like, and warn you if there are any problems.
Deselect any items you do not want to copy over (attached files, labels, restrictions)
Hit Copy.
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