Controlling Line Width
To assign width to polylines
- From the Draw menu, choose Polyline.
- Specify the start point for the first segment in the polyline.
- Enter w to specify the width.
- Enter a value for the width at the start of the line segment.
- Enter a value for the width at the end of the line segment.
- Specify the endpoint of the first segment of the polyline.
- Enter w to specify different widths for the next segment, or press ENTER to end the command.
Draw toolbar: 
Command line equivalent: PLINE