To sell your products and services, you will have to add them first on the backend. Then, you will categorize them under groups, and your storefront/client portal will display them.
First, add some categories.
For instance, if you are on Hosting or Web Agency Business, you could add some categories like this-
Let's begin by adding them to the backend.
First, go to "Product Groups" under "Products/Services."
Category Name: Give the name of your Category, for example- "Web Hosting."
Category Description: Put the description of your Category.