function modulename_form_alter(&$form, $form_state, $form_id) {
  if (strpos($form_id, "add_to_cart_form") !== FALSE || $form_id == 'uc_order_add_product_form') {
    if (!empty($form['attributes']) && is_array($form['attributes']) && count($form['attributes']) > 0) {
      if ($form_id === 'formID') {
         // how to create attributes & assign it to current form & preserve the data.
        $copyAttributes = $form['attributes']['12'];
        $form['attributes'][] = $copyAttributes;
        // krumo($form);
      }
    }
  }
}