title: Sharing configuration between jobs
body: <p>I have got a few Jenkins jobs. They look very similar to each other and differ only in details. Originally they were created by copying the first job.
  If something changes in one of the jobs configuration, then it has to be applied to all the other jobs configurations. This makes Jenkins maintenance more complex, longer and error-prone.</p>
  
  <p>What I'd like to do is to pull up at least some common parts of jobs' configuration and keep it in one place so I don't have to apply each configuration change to all the jobs separately. Is is possible, and if so, how can this be achieved?</p>
  
  <p>I would like not to create new project or change the way jobs are structured (upstream-downstream dependencies) as all these jobs are legacy.</p>
  
  <p>Thank you in advance!</p>