How do I move a solid object down only

I making a level for when the player spawns after 1 sec then the platform will go down and once it reaches the bottom I want it to stay there. Same for another platform that will go up. I just wanna know how I would be able to do that

All you need is combine the platform and solid behaviors into that falling objects.

The Ground is Solid only.

And when the falling objects Is On Floor > Sub Event : Compare Y < A number (example : LayoutHeight/2) -> Move all of them down X pixels.