Drupal → Темизация форм

function THEMENAME_theme() {
  return array(
    'commerce_checkout_form_checkout' => array(
      'render element' => 'form',
      'template' => 'commerce-checkout-form-checkout',
    ),
  );
}

<div class="row">
  <div class="col">
    <?php echo render($form['field_name1']); ?>
    <?php echo render($form['field_name2']); ?>
  </div>
  <div class="col">
    <?php echo render($form['field_name3']); ?>
  </div>
</div>
<?php echo drupal_render_children($form); ?>