Don't understand your question. COPA's website gives you a choice of five fare categories, including Economy Flex and Business Flex. Those are refundable fares. It does not allow you to be more specific in your selection of an economy fare class (i.e., an M vs. a Y). If you want to be more specific, you will have to call.

But note that since COPA really only has two business class fare classes, D and C, you are already being offered the only two business class options.