Preparing a 2D drawing
See also Tutorial Importing 2D geometry with bend lines.
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Open a DXF or DWG
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Remove excess objects, texts, dimensions, etc.
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Possibly draw line segment.
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If bending part is not recognized (sheet is shown light-grey), then export the file as
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Convert existing lines or newly drawn lines at the required places in the bending lines.
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Measure and check side lengths. If necessary, change processing strategy and adapted outer dimension.
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Create bending solution.
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Select Workflow using the
icon and click the 
2D part or use shortcut
key 2.-
The system switches back to 2D view.
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If necessary, measure and check side lengths again.