How do I make an object passable? {SOLVED}

So I'm fairly new to cc making and I wanted to make an object passable without having to start from a passable object like rugs or painting etc. So for example I started with the room divider object and I want to make Sims walk through it, how do I edit the object to how I intend it?


I'm having a hard time finding the same topic online since English is also not my first language so I don't know if I'm just using the wrong terms or what. 


Thanks in advance