Build what you want on CO.com and then hold it by selecting, "Pay with cash." Then, call the web support desk at 800.300.1547 option 3. Ask the agent to twiddle the fare class of the flight you wish and to reprice the reservation for you. Then, purchase via CO.com. This gets you 100% EQM and the fare classes you wish. Travelers must all have the same fare class for each flight. If you want different ones you'll have to use additional PNRs.