You can remove category that no longer required.

To delete an attribute

  1. Go to ADMIN SETUP> Product Administration > Catalog. The catlog page is displayed.
  2. Search for the category, and do one of the following:
    • To delete a single category, click the ellipsis icon () next to the attribute name, and click Delete.
    • To delete multiple categories, click the checkboxes next to the name column, and click the () icon.
    • To delete all categories, click the checkbox in the header row next to the name column, and click the () icon.
  3. Click Confirm.