这可以通过操纵全局变量来完成$submenu. 在本例中，帖子类型名称为portfolio. 请参见代码中的注释。

add_filter( \'custom_menu_order\', \'move_one_post_type_wpse_98281\' );

function move_one_post_type_wpse_98281( $menu_ord ) 
{
    global $submenu;
    // Enable the next line to inspect the $submenu values
    // echo \'<pre>\'.print_r($submenu,true).\'</pre>\';

    // Iterate through all submenu items
    foreach( $submenu[\'edit.php?post_type=portfolio\'] as $add_submenu )
    {
        // Move it inside the Post post type menu
        $submenu[\'edit.php\'][] = $add_submenu;
    }

    return $menu_ord;
}

然后，完全删除菜单项：

add_action( \'admin_menu\', \'remove_cpt_menu_wpse_98281\', 15 );

function remove_cpt_menu_wpse_98281() 
{
    remove_menu_page( \'edit.php?post_type=portfolio\' );
}

在本例中，我们迭代all post types 那是public and not built-in 并将子菜单移到默认的Post Post类型中
并删除具有相同参数的所有菜单。

Please, use this with care. In case of doubts/problems, use a One-by-One approach using the code above.

add_filter( \'custom_menu_order\', \'move_all_post_types_wpse_98281\' );
add_action( \'admin_menu\', \'remove_all_cpt_menu_wpse_98281\', 15 );

function move_all_post_types_wpse_98281( $menu_ord ) 
{
    global $submenu;
    $args=array(
      \'public\'   => true,
      \'_builtin\' => false
    ); 
    $post_types=get_post_types( $args );

    // Iterate through all post types
    foreach ($post_types as $post_type ) 
    {
        $cpt_submenu = \'edit.php?post_type=\' . $post_type;
        foreach( $submenu[ $cpt_submenu ] as $add_submenu )
        {
            $submenu[\'edit.php\'][] = $add_submenu;
        }
    }

    return $menu_ord;
}

function remove_all_cpt_menu_wpse_98281() 
{
    $args=array(
      \'public\'   => true,
      \'_builtin\' => false
    ); 
    $post_types=get_post_types( $args );
    foreach ($post_types  as $post_type ) 
    {
        remove_menu_page( \'edit.php?post_type=\' . $post_type );
    } 
}

结果如下。我会从所有帖子类型中删除“添加新内容”，因为每个帖子的主页中都有一个快捷方式：