Is it possible to create new repositories(other than the default /ccm/, /qm/, /rm) on jazz server so that it can be connected using rtc (repository connection).
As mentioned in Configuring the Jazz Team Server and the first application after the upgrade, those /ccm/, /qm/, /rm are "applications", not "repositories".
You can register a new application (in addition of the applications running on a common Jazz Team Server: Requirements Management (RM), Change and Configuration Management (CCM), Quality Management (QM), and Design Management (DM))
An example would be the Rational Git Adapter, with its url:
https://fully qualified hostname:port/gitAdapter.