In AutoTRAX you can add graphical polylines. In schematics they have no electrical significance. However, in PCBs they have significance if they are placed on electrical layers such as the top or bottom layer; here they will leave copper traces and will provide an electrical connection to everything that is connected to them.
Polylines have a width that can be zero for an infinitely thin arc. However if you add polylines to a PCB you need to make sure their width is at least the size of the manufacturing minimum width.
Polylines also have color and can be semi-transparent. It is even possible to define an invisible polyline. If you have snap to objects enabled, objects will snap to invisible polylines.
Polylines can also have a line style as shown below.