Custom fields for commercial customers

I work on the shop for polish customers. Because a polish law we need to create two type of cutomers: private and commercial. Commercial customer has to be able to fill two extra fields with VAT and company registration number.
Is there any way to do it within HikaShop or i need to get special com/mod to it?

For the VAT there is already a field that you can publish via the menu Display->Custom fields.
For the registration number, you can just create a new one on that same screen.

You might also want to edit the "address_template" view files via the menu Display->Views if you want to display them on the invoice.

Superb!
Thank you very much Nicolas