If you have a wall (a paralelogram B) and would like to open a window (a hole
being another paralelogram A) on it, this is impossible using Blender.
But you can create a new object (C) being the "difference" (inverse) of A - B.
This new object C will be the wall having the window. You only need to erase A
and B...
You will see the details of this operation at this 3D lesson.
Go to:
http://www.opencroquet.org/index.php/Island_Creator/Blender_Basic_Lessons_TOC
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