Hi guys I have a situation where I'm using VirtueMart and some products are very big so they need to be shipped as a separate package while the other products are small enough to be shipped together or with one big product. I can't find a shipping module that would do that so I wrote some code to try and adapt the standard shipping module. I added this code to the end of (just before the return statement) the get_rate_details function in /public_html/administrator/components/com_virtuemart/classes/shipping/standard_shipping.php but it does not make a difference even though the standard shipping module is enabled. Can anyone please tell me where to put this code or any other way to do this. $big_products = 0 ; for( $i = 0 ; $i < $cart["idx"] ; $i ++ ) { $tsku = $cart[$i]["product_sku"]; //current sku or product id if ($tsku == 'KG1' || $tsku == 'KG2' || $tsku == 'KG3' || $tsku == 'KG4' || $tsku == 'WMS1' || $tsku == 'MJ1') { $big_products += 1; } } if ($big_products > 0) { $rvalue += 36.55 * ($big_products - 1); //postal rate for extra package times number of extra big products } Code (markup):