I just followed this Randy Fay video which shows how to generate a charge based in the products weight. I works fine. It multiplies the weight of products by a Cost Per Pound (CPP)
I need this CPP to be different based in the total weight of ALL products in the order.
Example:
Order up to 1 pound ........ CPP = 0,006
Order with weight higher than 1 pounds ........ CPP = 0,004