UPS, UPSP and Drop-Shipping

Most of our products are shipped via UPS or USPS. I have those shipping modules installed and working correctly.

However, we also have a few very large items that require drop-shipping from the distributor with a fixed frieght cost.

First, I have no idea how to set up the large items for a fixed shipping cost.

And second, how can these be combined with normal items in the cart, but be excluded from the UPS/USPS shipping costs?

(I tried searching and came up with nothing that I understand.)

You would need some way to identify these products and then some way to calculate their shipping costs ...

That could then be added to regular charges for USPS or UPS when a combo cart exists ...