Delete a category
  1. Select any item.
  2. On the Edit menu, click Categories.
  3. Click Setup.
  4. Click the category you want to delete, and then click Delete.
  5. Click OK.

Note
  • If you delete a category from the Master Category List, the category is not deleted from items you've already assigned to that category. For example, if you assign items to the Personal category and later delete the Personal category from the Master Category List, you may still have items assigned to the Personal category. Items assigned to deleted categories keep their category assignments so you can find, sort, or filter them by those deleted categories.