how to add new roles not existed by default in windchill

You can add new roles directly to a team at the context level but if you want a role to be used in multiple contexts you should add the role using the Roles utility under the Organization. To go even further, if you want to use the roles in places other than a context team, like workflows, you'll also need to update the RoleRB.rbInfo file.

See the CS22330‌ article in the PTC Knowledge base - basically start by running enumcustomize in the Windchill Shell and navigate to <WT_HOME>/codebase/wt/project/RoleRB.RB.ser then rebuild/makeJar as directed