Seperate Shipping and Billing Address

Hello, in our system the billing and shipping address are different. But in nopCommerce both are displayed in the same combobox when making an order and both are saved in the same table and I could not find any field to distinguish between them. I want to show the user the Billing address when asking about the billing address and the shipping address when asked about the shipping address. Is there a way to do that?

This has to be customized. To nopCommerce, an address is an address. :)