You can customize the order class in the Admin around line 115 and change the order by to use the module:
Code:
$orders_products = $db->Execute("select orders_products_id, products_id, products_name, products_model,
products_price, products_tax, products_quantity,
final_price, onetime_charges,
product_is_free
from " . TABLE_ORDERS_PRODUCTS . "
where orders_id = '" . (int)$order_id . "'
order by orders_products_id");
try using:
Code:
$orders_products = $db->Execute("select orders_products_id, products_id, products_name, products_model,
products_price, products_tax, products_quantity,
final_price, onetime_charges,
product_is_free
from " . TABLE_ORDERS_PRODUCTS . "
where orders_id = '" . (int)$order_id . "'
order by products_model, orders_products_id");
and see if that gives the results that you are looking for ...