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On the Draw toolbar, select Line/Arc Continuous
or 
, depending on the application you are using.
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Select where you want the line to begin.
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Move the pointer to a position where the software recognizes the end point of a line on the drawing sheet.
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When the point on relationship indicator is displayed at the pointer, select to define the end of the line.
If Maintain Relationships is set, the software places a connect relationship handle where the two lines meet.