Now create another object centered on the bottom part. This time we're talking about a Box with these parameters: Length: 100, Width: 100, Height: 230, 3 Height Segments.
Move this object up as well. You can adjust the height better later, you just need to see it while you're working on it.
Convert the Box to an Editable Polygon (or add an Edit Poly modifier), then select the 4 topmost vertices.
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