You can definitely create an Adobe Portfolio site of content you'd like to sell. However, Adobe Portfolio does not currently have an E-Commerce function available.
You would need to specify purchasing instructions, handle those manually/separately, or use a third-party service such as Etsy, Society6, etc. We also suggest simply linking out to an external website in your Navigation.
Adobe Stock Contributors do however have the ability to publish and sell on their Adobe Portfolio websites. If you are interested in learning more about how to become an Adobe Stock Contributor please follow the link here.