When you make your texture, swap you background color with black. Black color is viewed as transparency in the game. Save your image as png and click Options..., the above image will show.
In transparency tab transparency is showned on the right
The image will be a png file
Close it after saving it, open it again and save it as a tga file.
Make a new cube and drag it in func_wall. In this case, all but south face will be black
Click inside surf2_alpha
Face Flags
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