Building in a Developer Sandbox and testing changes in a test release environment is the best practice for creating a new process that uses most of the objects that were deployed. A Developer Sandbox is a type of sandbox that provides an isolated copy of the production environment for development purposes. A test release environment is another type of sandbox that provides an isolated copy of the production environment for testing purposes before deploying changes to production.
By building in a Developer Sandbox, the admin can create and modify configurations without affecting the production environment or other sandboxes. By testing changes in a test release environment, the admin can validate and verify the functionality and performance of the new process before deploying it to production.