I have several long items ( 20 of 600) that carry a special package and handling charge. One item is charged 5.00 special box charge and 5.00 extra length for UPS Shipping and shipping generally costs about 13.00.

So a total shipping charge for 1 item is 23.50 So I have the weight set at 30 lb to calculate a reasonable shipping charge for the one item. Now suppose someone buys 2 of these items, the second item weighs literally nothing and has none of the 5.00 or 5.50 special packing charge because they have already paid that charge with the first item. It also may add 1.00 to the total.

What happens of course is someone orders 2 of these and it charges them 37.00 for shipping for the 2.

What can I do to get it not to charge anything for the 2nd and up to 5 more pieces that they order