add_posts_page Adds a submenu under the Posts menu
add_pages_page Adds a submenu under the Pages menu
add_media_page Adds a submenu under the Media menu
add_comments_page Adds a submenu under the Comments menu
add_theme_page Adds a submenu under the Appearance menu
add_plugin_page Adds a submenu under the Plugins menu
add_users_page Adds a submenu under the Users menu
add_management_page Adds a submenu under the Tools menu
add_options_page Adds a submenu under the Settings menu