If you’re wanting to copy one Circle of friends into another, it’s quite easy to do once you know where to click. Thanks to Chris Cartland for sharing this tip!
1) Go to Circles.
2) Click on a circle.
3) Click “View circle in tab”.
4) On the top right click “More actions” -> “Select all”.
Then you can drag everyone from one circle into another circle.
I’ve done this to create a few larger circles, mostly for ease of filtering when I’m seeing what’s going on. Great tip!