How can I hide certain submenus of the Settings tab in the dashboard?

If you would like to code it yourself, here is a good tutorial for customizing the Admin Menu. http://sixrevisions.com/wordpress/how-to-customize-the-wordpress-admin-area/

Copying from the tutorial, they remove the Editor sublink:

function remove_editor_menu() {
    remove_action('admin_menu', '_add_themes_utility_last', 101);
}
add_action('_admin_menu', 'remove_editor_menu', 1);

note: you need to know the function / action that displays it