To define a specific set of documents required for a business application, the steps involve creating Document Checklist Items within an Action Plan Template, targeting the Business License Application, and automating the association of this template with new applications. By specifying the required documents in the checklist items and publishing the Action Plan Template, a clear and consistent requirement is established. Automating the association of this template with new applications through flow automation ensures that every business application adheres to the same documentation standards, streamlining the process and enhancing compliance.