interspire cart shipping calculation

I need a professional who is experienced with Interspire Shopping Cart (version 5.5.4) - ([login to view URL]) to change the shipping calculation for us a little bit. For any drop ship items where the freight can't be calculated in our system we will add the item to the cart with the full value however in the shipping calculation we will leave this item out and put a note that the charges for this item can't be calculated and will be charged later. We will only calculate the actual shipping charge based on the items that allow calculation. We will need to add to the specific item(s) that can't be calculated a note in the order process so in the order management it will show that there was no shipping calculation for this item. Again, you MUST be experienced with Interspire - Only experienced people will be considered - NO EXCEPTIONS !!! Upon successful completion of this project, if everything goes well, we will have further work on other Interspire projects.