One of the common requirements of an online store is to hide certain categories and products from all but specific customers. When editing a category, product or version, you will see a dropdown menu selection for 'Limit by group'. In this way, you can link a category, product and/or version to a specific group. In this case, only customers who are logged in to the front end and are members of the appropriate group will be able to see these items. Other customers will not see them, or be able to find them in searches.