1. When you are initially creating the job, you can choose to create multiple copies of the job at the same time. Look in the top right corner of the job editor (To the right of the planned duration) and select the number of jobs you wish to create.
2. If the job has already been created, go to the jobs tab and find the job in the list. There are a few icons to the right of the job number. One of them looks like two pieces of paper stacked on top of each other. You can use this button to duplicate an existing job.