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Click Place Coordinate System Command on the vertical toolbar.
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Specify the origin of the coordinate system by clicking in a graphic view.
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Select the reference axis in the Axis box on the ribbon. This axis is the one that you want to define with your next click. North is the default.
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Define the direction of the reference axis by clicking in a graphic view. You can also define the bearing of the reference axis by using the Bearing Angle box on the ribbon.
The software always assumes that up is vertical.