405 advanced workouts?

Hey, I was wondering if anyone could explain how i go about making an “advanced workout” for my gamin 405. I have looked on garmin connect site a lot and never found where to do it. I have a speed run tomorrow that is 15’wu / 1’pickups2’easy/ 4x3’ on 1’ rest / 2x6’ on 2’ rest / 6x1’ / 10’cd . I was wondering how to make the workout so it beeps and laps at all those different intervals.
thanks in advance
-andrew