Flat rate Shipping on most items and freight on some

We use a drop shipper for 99% of our items. The final 1% is shipped via Freight. Each freight item will have a different shipping cost. One may be $50 freight another may be $200 in freight cost and so on.

My question is: For the Freight only items, how can we set zencart to hold the cart item till we can give a shipping cost then run the charge?

Each item that is shipped freight will have a different shipping cost that we will need to get from the drop shipper first.

We do not have any add-on shipping modules installed other than what comes with Zencart by default.

Hopefully this makes sense to someone and you can point us in the proper direction.

thanks,

Techextreme