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Click Select
on the vertical toolbar.
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Select Grid Plane in the Locate Filter box.
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Select the grid plane to rotate.
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Click Edit > Properties.
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Select the General Tab.
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Select the Axis of Rotation to use.
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Select the Rotation Offset Type you want to use. See General Tab (Grid Plane Properties Dialog) for information about the available types.
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Optionally, define an offset distance.
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Define the angle of rotation using either the Angle of Rotation box or the Slope (1/X) box.
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Click Apply.