Here is the main action going on, and i use the purchaseOrder varible to write out the values rest of the way

@{

   var purchaseOrder = SiteContext.Current.OrderContext.GetBasket().PurchaseOrder;
    decimal shippingPrice = 0;
    int shippingMethod = 0;
    int i = 0;
 int indexforshipping = 0;
   
 
    if(Request.Form["isPostBack"] != null)
 
    {
 int index = 0;
        foreach (var line in purchaseOrder.OrderLines)

 {
  if(Request.Form["quantityInput_" + @index.ToString()] == "0")
 
         {
              line.Delete();
   
            }
     
  else

                {

      line.Quantity = int.Parse(Request.Form["quantityInput_" + @index.ToString()]);
                    line.Update();
     
         }

         index++;

 }

    }
    Library.ExecuteBasketPipeline();

}