Just you “myoptions”, the following creates a sub menu item than links to the page edit admin
add_action('admin_menu', 'add_my_admin_subpage');
function add_my_admin_subpage() {
add_submenu_page('myoptions', // parent slug
'page title', // shouldn't matter
'test link', // menu text
'manage_options',
'edit.php?post_type=page');
}