There is a parameter in Orchestrator web.config that allows you to enable creating tenants. You can see an example of how this works in Orchestrator Community Edition - Become a tenant. And documentation with details about tenants: About the Tenant Context
Yes it is. You can check how it works using this link: UiPath
One more thing I have created simple file creation flow and when I published it in studio, Workflow is not getting into orchestrator, is there any communication needs to enable b/w studio and Orchestrator to populate published items in Orchestrator?