A repository domain is a group of linked PowerCenter repositories that consists of one global repository and one or more local repositories. You group repositories in a repository domain to share data and metadata between repositories. When working in a repository domain, you can perform the following tasks:
Promote metadata from a local repository to a global repository, making it accessible to all local repositories in the repository domain.
Copy objects from or create shortcuts to metadata in the global repository.
Copy objects from the local repository to the global repository.