[kevinslin]

multiple account support in amplify involves configuring amplify in each account to a particular branch. amplify doesn't support CI/CD types of deployment - instead, you would need to push to a 'dev' branch to triggers a dev build and then later push to a 'prod' branch to trigger a prod build. one reason we went with a central pipeline is to have a single account to manage all deployments as well as control what code gets to production.