Copy and Paste a Rule (Huh?)

For 4.3.3, the release notes say that you can copy and paste a rule. How do you do that?

I just got a replacement credit card, and so I thought that I could use this new feature. I want to copy the old credit card rule and then change certain specifics. But I can't figure out how to do that.

Help.

(I'll have it done manually before I need the answer, but I would still like to know)

You can access copy/paste via the Edit menu or using cmd-c/cmd-v. Note that you could always duplicate rules before by holding down option while click the + button under the rule list.