I want to show only categories and their subs on WooCommerce Shop Page

My client is asking for an unusual customization on his WooCommerce template. Apparently he believes it would be better for his customers to understand how to order his product if he has his store show only categories and their subcategories. Then when you click on a subcategory, it lists all the products from there. It would look something like this:

[ Parent Category1 . . . . . . . . . . . . . . . . . . . . ]

[ SubCat1 ] [ SubCat2 ] [ SubCat3 ] [ SubCat4 ]

[ Parent Category2 . . . . . . . . . . . . . . . . . . . . ]

[ SubCat1 ] [ SubCat2 ] [ SubCat3 ] [ SubCat4 ]

I’ve found a way to access categories, but I can’t loop the subcategories inside the category sections.

I’ve tried controlling the items on the shop page to only show subcategories, but only the first parent category shows and no subcategories show at all.

Anyone understand WooCommerce enough to help me?