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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 string under Graphic Type on the Construction Graphics Ribbon.
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Click Start Point .
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Click in the graphic view to begin placing the line. Then, drag the cursor in the direction that you want to draw the line, changing direction as required.
The default plane behavior is No Plane. To place the graphic along a plane, select the plane from the Plane option.
The line automatically follows the cursor as you click.
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When you have drawn the line, click Finish.
The Line string command allows you to select the entire line string, instead of line segments. To select only segments of a line, use the Line command.