Best way to swap parent page with multiple child pages?

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I am essentially trying to do the same thing as detailed in the link below but hopefully, with a non-code solution I can pass onto non-technical users on our sites.

[https://wordpress.stackexchange.com/questions/360992/swap-out-a-page-that-is-a-parent-to-a-many-many-pages](https://wordpress.stackexchange.com/questions/360992/swap-out-a-page-that-is-a-parent-to-a-many-many-pages)

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>I have a specific page on my site and I’m experimenting with some changes that are too complex to have a backup (page template change, custom fields etc).
>
>I duplicated the page using a plugin and made all the changes to this new page, including adding all the links to the child pages. I renamed the URL slug of the old page (now the backup) and then renamed the duplicate page to the old page’s original URL. When I went to click the links I kept getting 404’s until I realized that the child pages have a parent slug pointing to the old page. Here is what I’m talking about:
>
>*site.com/skin-care-treatment/skin/juvederm-voluma-2/* **This is what it was originally**
>
>*site.com/skin-care-treatment-old/skin/juvederm-voluma-2/* **All the pages were automatically changed to this**
>
>How do I fix this? Can I swap out the old page for the new somehow?

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