I have a client who sells his product by weight (1, 5, 10, 25, 50, 100, 250, 500, 1000 & 2200 lbs). So the shipping cost charged by the post office to mail the products varies by a significant margin.

Kentico only allows to setup a fixed/same cost for all shipping, so I assume I will have to customize the shipping portion of the shopping cart. Can you point me in the right direction - to customize the shipping portion of the shopping cart.

I am using Kentico 5.0 and, thanks in advance for any comment/suggestion.