As part of UBO’s final polish to Version 6, you’ll now notice support for Multiple Credit Cards per subscriber.
Look for a plus icon in the Billing Info Tab under Billing Options. This indicates that you can add more credit cards to the subscriber file.

Clicking on this will open the Subcriber Credit Card Info window that allows addition of multiple credit card numbers. It is also here that you choose the default Credit Card to be used.

If more than one card is already on file, an arrow icon replaces the plus icon.