So I created a new column in the cart called "Freeshipping". There's a new DB column called "shipping". They are binded together in the add to cart button on products_detail page. There's a new calculation called "ShipWeight" and has this calculation: (([Freeshipping] == '1')?[Weight]:0) * [Quantity]
I modified confirm.php with this: $Shipping_PackageArray[$Shipping_PackageIndex]["PackageWeight"] = "".WA_eCart_FormatNumber($WA_Store_Cart->TotalColumn('ShipWeight'), true, 1) ."";
So am I missing something?