There are times when you may have an applicant to one job, that you think may be a good fit for a different job.
Navigate to that applicant's applicant profile:
At the top-right, you will see an icon that looks like this:
When you click on that icon you will see a list of other open jobs that you can move this applicant to. You will also see the individual's match score for those jobs.
Click on the job you wish to move the applicant to and click at the bottom-right.