If your organization has many users, you can use the PPM open interface to create user accounts. This API uses interface tables within the PPM database instance. Data added to these interface tables is validated and eventually imported into standard database tables to generate users who you can then process normally within PPM. You can also import user information from LDAP servers.
For detailed information, see the Open Interface Guide and Reference, which provides an overview of relevant database tables and complete instructions on how to import users.