Every PrestaShop store has 3 customer groups by default - visitor, guest and customer. Each defines store visitors differently. A visitor is a person who has not created an account or is not logged in. A guest has placed an order in the store, but has not created an account. A customer is a person who has created an account in the store but has not necessarily made a purchase.
If you want to define a new custom customer group, in the Configure section select Shop Parameters, and Customer Settings. Go to the Groups tab. At the top of the page, in right-hand corner, select +add new group.
You will go to the page for creating a new group.
Click save.
After creating a group, go to edit by clicking the pencil icon in the list of all groups.
Here you can set details for your group. You can assign discounts to individual category groups, you can enable or disable the use/display of specific modules in the store.
Remember! When adding a new group to PrestaShop 1.7, the group is not assigned to any categories. After creating it, you need to add it manually. To assign a customer group to a category in PrestaShop 1.7, go to Catalog in the Sell section, select Categories and in the list search for the group you are interested in.
Go to edit category mode and search for the Group Access section. Select the new group and click save.