1)Export ascii file
2) open the ascii file and replace $$$ with null using text editor
3) create a new pcb, import modified ascii
Thank you for the answer, but that is not quite what I'm looking for. I want to have this prefix applied to every new net I create.
Your suggestion would work for the finished board and would not be very practical for the design phase.
For non-explicitely labled net, Pads logic assign it with $$$ prefix. it seems there is no way to change system's setting, but you can change it after exporting layout ascii from poowerlogic