Woocommerce

I have a site designed with woocommerce as the payment for the on line store. It is selling custom teddy bears, with many options. The goal is to raise funds for special needs children. This is a pro-bono project for my company. I want to create a similar shop to the following web site…

https://villycustoms.com/custom-builder/

Does anyone know how this was accomplished? I have the store up and running, need to figure out how the designer set up the selection section and integrated it with woocommerce.

Thanks