Import Shipping Prices

Does anyone know if it's possible to import shipping prices ?

I ship based on weight - I can't use the online quotes as they would be too expensive for most of my items. I use Royal Mail and a selection of other services to get the best possible prices for my customers.

The way cs-cart deals with shipping means it take for ever to make changes so I'm hoping I can do what I do in my oscommerce site and that is keep a record of weights / prices for different shipping zones around the world. It's then a simple task of importing that to the database to make a change.