Thanks, That helps. I think this should be a lot more straightforward than I originally thought.

I knew I could wire the new outlet to ground in the existing box through the green wire and have a solid ground. I just didn’t know if there were any reasons not to. I couldn’t think of any.

Also since that current outlet already has a ground without a ground wire, I was wondering if I should wire it up while I had it open. I’m going to.

I have the ground screws, some green wiring and the green ground twist connectors.

Thanks for confirming I was on the right path. It’s been awhile since I’ve touched electric, and I know that just because it works and tests right doesn’t always mean it is right.