A 'Category' question

[lostandfound]

How can I create sub category to a category without displaying it on the main page?
When you click on the appearance link on this website it takes you a second category section:
http://gallery.eva-the-diva.com/index.php

When I try to do this the category is posted below the main category on the main page.

[lostandfound]

DELETE THIS POST ... I figured it out.