How to stair/slab?

So I have some stairs, and I need them to face downward (similar to that of when stairs are placed on a block above you), however I am not sure on how to accomplish this. I’ve tried DirectionalData with Direction.DOWN and Direction.UP with no success, so I assume I am doing this wrong? What is the correct way to achieve this goal?

On a related note, how would one achieve an upward slab, not one on the ground.
Any help is appreciated.

Both use PortionData.

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Maybe this should have been obvious for the slabs, but I would have never have guessed for the stairs. Many thanks. :thumbsup: