How do you convert a 3D Polyline to a 2D Polyline?
You can use the
FLATTEN command to convert a 3D Polyline to a 2D Polyline .
FLATTEN projects the entities onto the X-Y plane of the current view, which in the case of a 3D polyline will convert it to a 2D Polyline.

When using this command in this manner make sure that you are in the
PLAN view of the world
UCS first, otherwise you will get unexpected results.

Converting a 3D Polyline to a 2D Polyline will result in the loss of any Z coordinate values. If this information is important to you, then you should convert a COPY of the original 3D Polyline, rather than working with it directly.
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