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Add sub menu page to the Links menu.
NOTE: If you're running into the »You do not have sufficient permissions to access this page.« message in a wp_die() screen, then you've hooked too early. The hook, you should use is admin_menu.
<?php
add_links_page( $page_title, $menu_title, $capability, $menu_slug, $function);
?>
Typical usage occurs in a function registered with the 'admin_menu' hook (see Adding Administration Menus):
add_action('admin_menu', 'my_plugin_menu');
function my_plugin_menu() {
add_links_page('My Plugin Links', 'My Plugin', 'read', 'my-unique-identifier', 'my_plugin_function');
}
add_links_page() is located in wp-admin/includes/plugin.php.
Administration Menus: add_menu_page(), remove_menu_page(), add_submenu_page(), remove_submenu_page(), add_dashboard_page(), add_posts_page(), add_media_page(), add_links_page(), add_pages_page(), add_comments_page(), add_theme_page(), add_plugins_page(), add_users_page(), add_management_page(), add_options_page()