You can delete Products from your SIX Catalog individually or you can delete multiple Products at one time using the Delete button. You can select multiple Products in the grid by holding down Shift (to select a series) or Ctrl (to select outside of a series).
You can also delete all the Products assigned to a Manufacturer via the Manage Manufacturers interface under Settings. Deleting a Manufacturer will delete all Products from your Catalog assigned to the Manufacturer.