We have some big products that will ship in multiple packages, and of course each of the packages will have their own weight and dimensions. Also, some overweight packages will need to ship in freight
What's more, we have different set of products that are coming from different warehouses. We will definitely use UPS to ship, probably Fedex also (probably not many people will use it, but it is good to offer the option)

Anyone got any suggestion for this special situation? We got stuck in this problem, big time, any help would be greatly appreciated, thanks.