Kelly,
If all you want is for the flaperons to move as flaps on the ch 6 dial, simply turn on flaptrim, the feature that gives you flap action on that dial.

if you want the flaps to move on switch C you can use airbrake.

if you want the flaps to move anywhere else, simply do an OFST to FLP mix, set the desired percent, and set the desired switch. This moves the flaperons together as flaps the desired offset distance when taht switch is active.