A job's Requisition ID (Req ID) allows your organization to identify and track a job based on alphanumeric naming conventions unique to your company's internal processes.
In Greenhouse Recruiting, the ability to update a job's Req ID depends on that job's approval process.
If your organization doesn't use a job approval process, you can simply update the ReqID on the Job Info tab for the job. (Job Dashboard > Job Setup > Job Info > Req ID)
To edit the field, hover over the Req ID and click the Edit icon.
Enter your new Req ID and click Save Changes.