Hi, I was wondering if I can do this, I have free shipping on orders over $80 but need to add a shipping charge only on certain items.

What I did was, first I set a minimum order amount with the CartMinOrderAmount appconfig and it works perfectly, then on the Shipping Rates Table I set the Calculate Shipping By Total option to give me free shipping on orders over $80, but despite this free shipping I need to add a certain shipping charge amount on just some selected items, even with the free shipping option working.

Is this possible? I really need this to work