1. From your Fulfill Engine Store homepage go to the Products page.

2. From the products page select the product name of the product that you would like to nest designs under one listing.

3. On the product page select Tasks > +Add nested products. This will prompt you back into the product builder. 

You also have the option to Set nested products. This will allow you to select existing built products vs building them new.

4. Nesting causes the products to be merged into one listing. The nested products will no longer appear on your storefront.

Storefront before setting child products.

Storefront after setting child products