If you delete a category with subcategories, the subcategories are not deleted. However, they are orphaned, which means that they are not listed under the Categories section and you cannot perform maintenance on them.
To delete a category or subcategory:
Select a category from the Categories list. If necessary, use the + and - keys to expand and collapse the list.
Click Delete category and the Attention section is displayed.
Click Delete to permanently remove the category.