Custom application fields allow your organization to track responses to questions that matter to your organization across jobs.
After you have created a custom application field, the question will appear as part of any pre-existing candidate application.
Since the custom application field was created after the candidate submitted to the job, you will have to manually enter their response into application field.
To manually record/responses to custom application fields for existing candidates, navigate to the candidate's profile. Click the Application tab from the On Job panel.
Expand the Application Custom Fields section and click beside your new application question.
Input the candidate's response and click Save to confirm the change.