The Line Style for Lines and Routes can be changed to a Dotted Line or Dashed Line.

Changing the Line Style

Line Style can be toggled from "Solid Line", "Dashed Line", "Dotted Line", "Chained Line", and "Chain Double-Dashed Line".

Method 1: Property Window => Change "Line Style"
Method 2: Select an object after drawing and double-click to change from the Attribute screen