To Create Lines By Selecting a Start and End Point

Click Home tabDraw panelLine drop-downCreate Line Find.
Specify the start point.
You can use the pointing device or enter coordinate values on the command line.
Complete the first line segment by specifying the endpoint.
To undo the previous line segment during the Line command, enter U or click Undo on the toolbar.
Specify the endpoints of any additional line segments.
Press Enter to end or C to close a series of line segments.
To start a new line at the endpoint of the last line drawn, start the Line command again and press Enter at the Specify Start Point prompt.