Is there a way to buy a round trip ticket and get on at different airports in flordia?

hey wanted to know if anyone knows cause my wife ask me if it is possible to buy a round trip airfare for example to make my question bit easier to understand like you going to Miami and when you leave you get on at orlando. confused i was when she asked me. the only way i knew we could do that is buy to one ways one to Miami and one set back to newark. so if anyone knows if it is possible to buy round trip ticket adn instead of departing from the Miami airport you can depart from orlando.