I try to explain what I need with an example.
I sell products from different manufacturer around the world. My base is Italy. I do not send products from Italy, products can be sended directly from China, Equador, Congo, etc... for example; but they are bought on my website. So shipping method should be calculated according to product and not to my base (Italy).
Example: A user from Los Angeles buy a product on my site. This product should be sent from China, so shipping costs and method should be calculated from Beijing to Los-Angeles for example and not from Italy to Los-Angeles
How can I do that?