When some products in your catalog have specific characteristics in common and need to be handled together, it may be a good idea to configure a product class for them.
To create a new product class:
On the product class listing page in your store's Admin area, click the New product class button:
X-Cart 5.4.x - Catalog > Classes & Attributes
X-Cart 5.5.x - Catalog > Classes & Attributes > Product Classes
Enter the new product class name on a blank line that appears below.
Click Save changes. The newly created product class will be saved and added to the product class list.
If necessary, you can edit the product class name or delete the product class altogether.