There are several steps to completing a job description. These steps include completing a job analysis, recording the basic purpose and functions of the job, and detailing necessary qualifications.
Prepare job summaries, if relevant. You can use the job description template you use for each position that you advertise by filling in the template with the information that is relevant to that position. However, if you do (or expect to do) a lot of hiring of a particular position, you might make a special template that includes a summary of that job. This will save you some time.