Best practices for setting up customers and vendors in a multicurrency environment.

Hi All, we have recently acquired a company in the UK. Up until now we have been a strict USD JD Edwards shop. We have had some guidance from consultants to keep our USD vendors and customers separate from the GBP vendors and customers. We are looking for best practices in this regard. In addition we are wondering if anyone can recommend a good way for a user to be able to know if the customer or vendor is USD or GBP at a glance (without drilling into the records to see the MCU or assigned currency fields).