Customize admin panel for custom types

custom_functions.php

<?php
add_filter( 'manage_edit-orders_columns', 'admin_orders_header_columns', 10, 1);
add_action( 'manage_orders_posts_custom_column', 'admin_orders_data_row', 10, 2);
add_filter( 'manage_edit-orders_sortable_columns', 'admin_orders_sortable_columns' );

function admin_orders_header_columns($columns)
{
  $columns = array(
    'cb' => '<input type="checkbox" />',
    'title' => __( 'Заказ' ),
    'ordersum' => __( 'Сумма' ),
    'author' => __( 'Клиент' ),
    'orderstatus' => __( 'Статус' ),
    'date' => __( 'Дата' )
  );
  return $columns;
}
function admin_orders_data_row($column, $post_id)
{
  switch($column)
  {
    case 'ordersum':
      $ordersum = get_post_meta($post_id, 'wpcf-order_sum', true);
      if ($ordersum) echo $ordersum;
      break;
    case 'orderstatus':
      $order_status = "";
      $terms = get_the_terms(get_the_ID(), 'orderstatus');
      foreach($terms as $term)
      {
        $order_status = $term->name;
      }
      echo $order_status;
      break;
    default:
      break;
  }
}

function admin_orders_sortable_columns( $columns ) {

  $columns['ordersum'] = 'Сумма';
  $columns['orderstatus'] = 'Статус';

  return $columns;
}