You go into build see the hammer on the bar? Click it then click 'Delete wall sections.' Voola
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You can't.
don't know i just asked that quiestion.
press CTRL while on create a wall tool :D x
On build mode, go to sledge hammer and chop down the wall
You dont exacally you just make a new game and save over the one you want to delete......... Well it works for me ;-l