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Click Insert > Construction Graphics.
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Select More from the System list.
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Select the system under which you want to group the construction graphics.
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Click OK.
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Click Line under Graphic Type on the Construction Graphics Ribbon.
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Click Start Point .
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Click in the graphic view, and drag the cursor to extend the line.
The default plane behavior is No Plane. To place the graphic along a plane, select the plane from the Plane option.
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Click one time to end the line.
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Click again anywhere in the view to draw another line.
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Click Close to exit the command.
You can draw lines in any direction that you want.