You have an App Engine project used for development and want a separate production project. What is the recommended procedure?

The recommended procedure is to create a new Google Cloud project using gcloud projects create and then deploy your application to this new project. This approach ensures a clean separation between development and production environments, which is a best practice for managing resources, permissions, and billing. Deploying the application to the new project means you're deploying the source code, not copying an existing deployment. Copying a deployed application is not a standard or efficient method for migrating or separating environments; deployments are typically managed through source code and CI/CD pipelines. While Deployment Manager can manage infrastructure, it's not designed to copy existing App Engine application deployments between projects. You cannot create a new project by simply specifying a project parameter during an application deployment; project creation is a separate administrative step.