The following instructions describe how to show multiple designs under the same product listing.
1. From your Fulfill Engine campaign page go to the products page.
2. From the products page click on the product name of the product that you would like to nest designs under one listing.
3. On the product page click tasks -> Set child products. Then choose the child product to be merged on the storefront.
4. This action will cause the products to be merged into one listing. The child products will no longer appear on your storefront.
Storefront before setting child products.
Storefront after setting child products