I have an old computer that I fixed up, and I'd like to use it for my coding (right now, I'm working on debianizing the games at stabyourself.net. Don't worry; the liscense allows it!)

I have already built a few on my main computer, and I'd like to sort of migrate my packaging to the old computer. Unfortunately, I would have to generate another key for the second computer, and I'd prefer not to do that. I know that you can import someone else's key, sort of as a "recognized person," but how do I import a key as one of MY keys? (P.S., I do have the secret password thingy. That's how I've been signing the packages, after all.)