1. Click on System Config > Product Config from the left menu.

  2. Click on the Description of the Field type that you want to add products to.

  3. Click on the Groups tab.

  4. Select Add more Groups

  5. Enter the group name in the Description field.

  6. Click Save Changes to associate the group to the Product Group Field.



  7. This will successfully have added the group to the product field.
    You can also manage the membership of products within the groups with the article below.
    Adding/removing Product Membership of a Group