If a requisition is associated with existing applicants, you will not be able to add assessment questions to the application. We do not allow the application to be modified after a candidate has applied. Since a candidate can only apply to a requisition one time, if a requisition were updated after initial applications were received, it may show favoritism to those candidates that were able to answer additional questions.
If no one has applied to the requisition, you can recall the requisition and then republish it after you have added the additional assessment questions to the job in Job Master.
If you need to add assessment questions to a requisition to which candidates have already applied, close out the requisition that is open and create a new requisition after you have added the assessment questions to the job in Job Master. The candidates can then reapply to the new requisition you created.