You can edit a product group as required when the requirement changes. 

To edit a product group

  1. Go to ADMIN SETUP > Product Administration > Product Groups
  2. Search for the product group you want to update.
  3. Click the ellipsis icon next to the product group name and click Edit. The Product Group details page is displayed.
  4. On the Details tab, update the required fields.
  5. Click Save.
  6. On the Associated Products tab, associate products with the product group.
  7. On the Constraint Rules tab, create constraint rules for the product group.