Setting up XY Ambient & Reverb sound Parameter Box

To whomever that can help me.

I am a beginner at this so I apologise for the wording of this.

I have multiple sounds in my game level, however I want to draw a box around the sounds to contain them in certain parts of the game map. For example I have a desert and then I have a temple.

I want to be able to draw a box within these environments so that I wont be able to hear the sounds from the desert from when I am inside the temple and vice versa.

How do I draw this XY box so I can set these parameters within the game level?

Step by step instructions would mean a lot and if you have screen shots that would be even better!

Thank you in advance

Chris