Hi, I am trying to see if zen cart can be an easy solution for my site, I have a really small store, just 4 items for sale but my shipping works like this.

Product 1, 2 and 3 shipping=4 no matter how many of each or if it is just one of them always is 4.

Product 4 shipping=6

Now when combine product 4 with any of product 1, 2, 3, the shipping remains 6 but when the order is with just one or many of product 1, 2, 3 the shipping is only 4.

thanks.