Is there a way in the hammer sdk to make a wall that props can pass but players carnt, Thanks! Also if you wanna just link to some some giant text tutorial that would be fine too 
Props, as in just models and shit right not some Prop Hunt thing?
Use a player-clip.
Nether heard of that, but now when i google i have something usefull, as i google so many thing, and player will be a able to fire a prop or entity trough this wall but player should not be ablke to pass, Thanks