Shopify has inbuilt features to show carrier calculated rates for the entire cart. This means that if you integrate a shipper like Fedex or DHL, it will show "Live Shipping Rates" on checkout and the customer can select his preferred carrier. However, to achieve this at a Vendor level by breaking down the Cart into sub-orders is currently not possible directly. Please reach out to us at team@shipturtle.com so we can give a custom quote after understanding your requirement.