i want to swap a fizzler wall with a combine barrier wall when the player steps on a trigger. i want it to be able to go back and forth (toggle which wall is on)
how do i do this?

Can we have an example please? Difficult to imagine what you want to do. Do you mean block off a path that has a fizzler on it with a combine wall?

I've done it by making the combine barrier brush and the fizzler brush on the same spot, then setting them to enable/disable on different values from a loigc_branch. I think that's what you mean, hope it helps.