Select the 'Draw Line' button and command prompt reads:
Give Start Point:
Select the first end point of the line using any of the snaps and input options. A dynamic line will be drawn from this point to the cursor. The prompt now reads:
When a second point is indicated using any of the snaps and input options the line is drawn between the two points selected and the dynamic line is now drawn from the second point to the cursor.
Further points can now be selected to continue to draw lines 'end' to 'end'. Right click the mouse to cancel the command.