eCommerce and the sitemap - how can I move all children to a new parent product page?

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We are using eCommerce 1.8.2 - c5 running 5.4.1.1
1. Client built a new product page to replace a previous one. The previous page had 300+ children product pages.
a. Is there a way to move multiple child pages to a new parent?
I did some digging in the db and I see that I should be able to do this manually in the Pages table with three statements. Seems like the UI is missing some functionality.