How do I delete a category or subcategory?
Visit the Admin > Catalog, then click List under Categories and select the category or sub-category that you wish to delete.
You will not be able to retrieve the content that is in the page of the category, so it is recommended to back up the data in the category.
Make sure to check if they are any sub-categories within the category that you plan to delete, since they will be deleted as well. If you do not want these sub-categories to be deleted, simply change the parent ID of these sub-categories to move them to other categories.
Now go to the bottom left of the page and click on Delete Category and then click "OK" to confirm this action.