I’m not sure what you’re asking but You could simply use set Collision Response to channel on the mesh using the physics assets. For instance setting physicsbody to ignore make is so it does not collide with itself and setting pawn to ignore makes it so the pawns pass right through it. In the event that you need other physics bodies to collide with it but not itself make a new object channel in Project settings > Collision. In the properties panel of the mesh in collision presets set preset to custom and set object type to your new channel and simple change it’s response to block or ignore on the new channel as needed.