You could also motor group them in the motor and sensor setup section:
Example:
vex::motor_group arm (LA, RA)
if(Controller1.ButtonR1.pressing()) {
arm.spin(vex::directionType::rev, armSpeedPCT, vex::velocityUnits::pct);
}
else if(Controller1.ButtonR2.pressing()) {
arm.spin(vex::directionType::fwd, DownSpeedPCT, vex::velocityUnits::pct);
}
else {
arm.stop(vex::brakeType::hold);
}