Adding Shipping Address without Billing Address

-- url of the page with the problem -- : tiny.cc/d6rc3w
-- HikaShop version -- : 2.1.3
-- Joomla version -- : 2.5
-- PHP version -- : 5.3.25
-- Browser(s) name and version -- : Firefox 23
-- Error-message(debug-mod must be tuned on) -- : Error_message

Hi,

As it now on the checkout page you have Billing address and Shipping Address.
When you add one to Billing Address it also appears as Shipping Address.

My client would like to keep them separately. For example when you add a several Shipping Address only on the right side where the Shipping Address are shown should the new Addresses be shown. Not on the left side where the Billing Address are.
Several companies have multiple Shipping Address but one (or more but different) Billing Address.
I can follow the clients logic with this. If I'm not mistaken in redshop this was possible and I remember that in the table in the database they use a field and put BT and ST. Not sure what the T stands for but B and S are obviously Billing and Shipping.

Hopefully this is already possible in HikaShop and I didn't see it yet how to do it.

Thanks