Default Currency based on customer address

Is there a way to edit enable CS-Cart to default to a currency based on the customer's address? or even if i have to change or add a customer usergroup for this. I've heard it's possible with Localization but I tried it and I don't like how it almost splits in the site into 2. I made design modifications on some things on the site and when I tried Localization they disappeared and then once I deleted the Localization it came back.

Thank you for the help or advice.