I need to route GND and Vcc traces of various width with the autorouter. I defined several net classes with different trace widths. However One can only apply one net class to GND or Vcc nets. I tried the following : define several GNDx and Vccx symbols, one for each trace width, apply one net class to each, then connect all the Vdds and GNDs together in the schematic. The first time I run the autorouter this scheme works. But if I go back in schematics and do changes, eg connect a pin to GND1 instead of straight GND, change the class of this net to GND1, then reroute the board, all GNDx traces become of the same net class, and I loose the expected track widths. Is there any way to do this correctly ?