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Sorry, but no. I've done large and dense high-voltage power supply designs that ended up with dozens of class-to-class rules. I had to make a separate spreadsheet to keep track of all of the different rules and spacings, then created the conditional rules from that. You still have to put in the work, but the spreadsheet makes it easier to do.
Yes that's what I had to do. I had hoped there was a better way that I had not seen.
If it were possible to have a conditional rule like "Class against anything else not in that Class" that would get rid of the need for many of the cross Class rules in the "matrix" we have to enter in the rules set. The "Class against All" does not seem to do that according to my tests.
Maybe this has been implemented in later versions, I'm still using 2005. Also it doesn't help that sending rules Logic to Layout does not work correctly.
Mentor did improve the rule passing between Layout and Logic in V9.#.