Due to the fact that Job Titles can be tied to historical data, R365 does not allow for Jobs to be deleted. 

However, a few steps can be taken to ensure that this Job is not available for use:

  1.  Mark the Job as 'Exclude From Schedule' on the Job record. This will ensure that the Job will not appear on the Schedule Calendar

  2.  Update the name on the Job record to include 'DO NOT USE'