Answered: On/Off switch

Is there someway to use the Vex controller I/O port to activate a switch?
I need to turn on/off 4 leds on they’re own little pc board.
If I use a relay connected to the Vex would that work?

Yes you could use a relay provided the relay you select can be energized using the voltage and current spec of the Vex Controller. You could also use a Vex Motor or Servo with the proper linkage to turn a mechanical switch On and Off.