register_taxonomy and custom category list

Hi.. i’m adding a new post type and i’m trying to show only certain categories for this pages. I.e.:

register_taxonomy('Category', 'movies', array('hierarchical' => true, 'label' => __('Category')));

this adds the category sidebar widget but it shows all the categories. Is there a way to limit the categories, showing only certain categories and subcategories ?

Thanks beforhand