add_filter( 'register_post_type_args', function ( $args, $post_type ) {
	if ( $post_type == "sub" ) {
		$args['show_in_menu']        = 'edit.php?post_type=top';
		$args['labels']['all_items'] = __( 'All Sub Items', 'my-text-domain' );
	}
	return $args;
}, 11, 2 );