How do you duplicate a file in XCode?

Anyone know a good solution?

So far I have not found a better way than using File>New file and then copying contents from old file to new.

You can probably duplicate in Finder and re-import but that's almost same amount of work: switching to finder, duplicate, import new files.

Doing this with one class is not so hard, but what to do if you need to generate 10+ similar Classes based on superclass.

In Eclipse you select file and then copy/paste it in same folder. In finder there's Duplicate.

There's a menu Edit > Duplicate. But it's ALWAYS disabled. I tried selecting various files, classes, methods. It's still disabled.