In my case, I had to copy over a job from one jenkins instance to another.
So first I looked under the directory structure of the old Jenkins (the job/directory name; also noted the config.xml) and then under the directory structure of the new jenkins where I then created a directory with same name/job and copied over the config.xml under this newly created dir.
Then under, "Manage Jenkins", I hit "Reload Configuration from Disk". Thats it.