How do I drop/fall though a platform?

I want to have a platform that can be jump and fall/drop though at the same time? Right now I'm using the jump though behavior, but i don't see a way to make the character/sprite go down though the platform. Is their a way to do this with or without add-ons? Thanks!

This can be done using the platformer and jump through behaviour:

This can be done using the platformer and jump through behaviour:

Thanks!