Adding a sub-category is easy and can be a great way to manage your categories and keywords.
1.) When creating a new keyword, click on "add as a sub-category" and select the parent category you want the sub-category to be placed within. Once you name your new sub-category, and add a keyword, your new sub-category will be created.
2.) You can also edit an existing category and convert it into a sub-category. Click on the pencil icon to the right of the category, located within your dashboard.
Simply select a parent category beside "Assign a Parent Category", and click on "Update Category Name".
Your category will now be converted to a new sub-category, with the existing keywords, and historical information.