Thanks but I was wondering, When I click the Trigger_multiple add entity button to add to my brush, I can still see the brush when I try it out. Also the words dont popout as well
It's difficult to tell whether you're doing it wrong or not, but this is how it works for me. I make a brush, then I press E to open the entity window. I then select trigger_multiple from the list and then press the "Make Entity" button. This makes the brush into that specific entity, and it should change color from a white brush into a gray one. After that's done, I just add the necessary features into it, change its size to whatever suits the map, and it's ready.
The fact that you can still see it makes me think that you didn't manage to make it into an actual entity.
Also my carve function is not working.
I also can't help you with this one if it's an actual bug with the program. But to carve something, you're better off moving the object outside the map because it might mess with the other brushes around it without you knowing, which will be messy. I'm just brainstorming that the program might be kind enough to not allow you to destroy your map, which is why it refuses to trigger, although that's really far fetched. Just test it out in a place where nothing can go wrong, and if it still fails, look into your methods of how you use it, like you should only select the brush you want to carve with, and you shouldn't press the "merge" button etc. Just look into it.
Sorry, I'm a bit chatty when I'm supposed to study :p
Edit: I just noticed that "carve" isn't the thing I'm talking about. To make a hidden passage as in my picture, you need to use the "subtract selected brushes from world" button. How far do you actually get with the carve button? Do you get the carving triangle to appear when you press "create clippers from current face", and can you move it around etc.?