Добавить подменю в плагин формы кальдеры в WordPress

Я хочу добавить подменю в плагин формы кальдеры, но я не могу найти, как это сделать. Основной файл плагина показан ниже

<?php
/*
Plugin Name: Caldera Forms
Plugin URI: https://CalderaForms.com
Description: Easy to use, grid based responsive form builder for creating simple to complex forms.
Author: CalderaWP
Version: 1.4.7
Author URI: http://CalderaLabs.org
Text Domain: caldera-forms
GitHub Plugin URI: https://github.com/CalderaWP/Caldera-Forms/
GitHub Branch:     1.4.x
*/// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
die;
}

define('CFCORE_PATH', plugin_dir_path(__FILE__));
define('CFCORE_URL', plugin_dir_url(__FILE__));
define('CFCORE_VER', '1.4.6.7');
define('CFCORE_EXTEND_URL', 'https://api.calderaforms.com/1.0/');
define('CFCORE_BASENAME', plugin_basename( __FILE__ ));

/**
* Caldera Forms DB version
*
* @since 1.3.4
*
* PLEASE keep this an integer
*/
define( 'CF_DB', 4 );

// init internals of CF
include_once CFCORE_PATH . 'classes/core.php'; // needs the core at the very least before plugins loaded
add_action( 'init', array( 'Caldera_Forms', 'init_cf_internal' ) );
// table builder
register_activation_hook( __FILE__, array( 'Caldera_Forms', 'activate_caldera_forms' ) );

// load system
add_action( 'plugins_loaded', 'caldera_forms_load', 0 );
function caldera_forms_load(){

include_once CFCORE_PATH . 'classes/autoloader.php';
include_once CFCORE_PATH . 'classes/widget.php';
Caldera_Forms_Autoloader::add_root( 'Caldera_Forms_DB', CFCORE_PATH . 'classes/db' );
Caldera_Forms_Autoloader::add_root( 'Caldera_Forms_Entry', CFCORE_PATH . 'classes/entry' );
Caldera_Forms_Autoloader::add_root( 'Caldera_Forms_Email', CFCORE_PATH . 'classes/email' );
Caldera_Forms_Autoloader::add_root( 'Caldera_Forms_Admin', CFCORE_PATH . 'classes/admin' );
Caldera_Forms_Autoloader::add_root( 'Caldera_Forms_Render', CFCORE_PATH . 'classes/render' );
Caldera_Forms_Autoloader::add_root( 'Caldera_Forms_CSV', CFCORE_PATH . 'classes/csv' );
Caldera_Forms_Autoloader::add_root( 'Caldera_Forms_Processor_Interface', CFCORE_PATH . 'processors/classes/interfaces' );
Caldera_Forms_Autoloader::add_root( 'Caldera_Forms_API', CFCORE_PATH . 'classes/api' );
Caldera_Forms_Autoloader::add_root( 'Caldera_Forms_Field', CFCORE_PATH . 'classes/field' );
Caldera_Forms_Autoloader::add_root( 'Caldera_Forms_Magic', CFCORE_PATH . 'classes/magic' );
Caldera_Forms_Autoloader::add_root( 'Caldera_Forms_Processor', CFCORE_PATH . 'processors/classes' );

Caldera_Forms_Autoloader::add_root( 'Caldera_Forms', CFCORE_PATH . 'classes' );
Caldera_Forms_Autoloader::register();

// includes
include_once CFCORE_PATH . 'includes/ajax.php';
include_once CFCORE_PATH . 'includes/field_processors.php';
include_once CFCORE_PATH . 'includes/custom_field_class.php';
include_once CFCORE_PATH . 'includes/filter_addon_plugins.php';
include_once CFCORE_PATH . 'includes/compat.php';
include_once CFCORE_PATH . 'processors/functions.php';
include_once CFCORE_PATH . 'includes/functions.php';

/**
* Runs after all of the includes and autoload setup is done in Caldera Forms core
*
* @since 1.3.5.3
*/
do_action( 'caldera_forms_includes_complete' );

}

add_action( 'plugins_loaded', array( 'Caldera_Forms', 'get_instance' ) );
add_action( 'plugins_loaded', array( 'Caldera_Forms_Tracking', 'get_instance' ) );// Admin & Admin Ajax stuff.
if ( is_admin() || defined( 'DOING_AJAX' ) ) {
add_action( 'plugins_loaded', array( 'Caldera_Forms_Admin', 'get_instance' ) );
add_action( 'plugins_loaded', array( 'Caldera_Forms_Support', 'get_instance' ) );
include_once CFCORE_PATH . 'includes/plugin-page-banner.php';
}

Я хочу добавить подменю, чтобы показать формы записей, представленных пользователем только для использования администратором.