creating a new page based on existing page layout

Hi Will,

First, here's a post that will give you a bit of an overview of Divi:

https://www.elegantthemes.com/documentation/divi/visual-builder/

At a guess, I'd imagine that the products in the Ashley Hall group have been assigned to a category called "Ashley Hall". If that's the case, the "Ashley Hall" level page may just be the automatically generated category archive "page". And in that case, there isn't really a page for you to copy. Instead you just need to create a new category and assign your products for the new group to this category.

You can assign a product to categories by opening it in the back-end (e.g. by clicking "Edit Product", or something similar, in the black admin bar at the top of the page). In the right side panel of this Edit Product screen you should a categories section. The first time you do this, use the option to create a new category (with the "Ashley Hall" level group name) and also set its parent category (e.g. "Charleston Gates" in your example above). Then on the other products, open for editing in the same way and assign them to this same category (which will now exist so doesn't need recreated).

Hopefully that's how your site is set up, but if you'd like to share a link to the site it should be possible to confirm this / check if any other setup has been used.

Thanks!