I see there's no "duplicate" when I right click on a .xib. So is the way to do it: just to go to finder, copy the file to another name, and then drag it to my resources? Would that be all I'd need to do?
[Note: just wondering if there's other files or settings I need to bother with.]
The best way to do this is use cmd ⌘ ,shift, s on the xib or storyboard. Then save it with a new name or location.