I'm not sure what you mean by below:
<?php
$WADAorders_details = new WA_MySQLi_RS("WADAorders_details",$DealersSupplyCo,1);
$WADAorders_details->setQuery("SELECT OrderID, OrderAmount, OrderShipName, OrderShipAddress, OrderShipAddress2, OrderCity, OrderState, OrderZip, OrderCountry, OrderPhone, OrderFax, OrderShipping, OrderTax, OrderEmail, OrderDate FROM orders WHERE orders.OrderID = ?");
$WADAorders_details->bindParam("s", "".($_GET['OrderID']) ."", "-1"); //ParamOrderID
$WADAorders_details->execute();
?>
<?php
$OrderDetails = new WA_MySQLi_RS("OrderDetails",$DealersSupplyCo,1);
$OrderDetails->setQuery("SELECT * FROM orderdetails WHERE DetailOrderID =?");
$OrderDetails->bindParam("i", "".($WADAorders.getColumnVal("OrderID")) ."", "-1"); //colname
$OrderDetails->execute();
?>
Also , shouldn't this be WADAorders_details.getColumnVal?