You can create a schematic line from an AutoCAD® line, arc, or polyline. 
- Draw an AutoCAD line, arc, or polyline. 
 
- Right-click the object to convert, and click Convert to 
Schematic Line.  
- Do one of the following: 
- Press Enter or enter n (no) to leave the layout geometry in the drawing. 
 
- Enter y (yes) to erase the layout geometry from the drawing. 
 
 The software displays the Modify Schematic Lines dialog. 
  
- In the Modify Schematic Lines dialog, specify a System, Style, and Designation ID. 
You can also specify these properties on the command line. Enter sy (system), enter st (style), or enter i (designation ID). 
 Tip: To assign the properties of an existing schematic line to the converted schematic line, enter m (match), select an existing schematic line, specify what properties to match, and then press Enter.