If you are talking about creating multiple projects, you can simply do that by using this in your openinference code:
resource = Resource(attributes={ResourceAttributes.PROJECT_NAME: project_name})
tracer_provider = trace_sdk.TracerProvider(resource=resource)Where project_name would be your project name. In this way, if you were to send some spans using a project name "dev", you would see two projects in the dashboard now, default and dev.
If you are referring to creating projects inside a project, I am not sure if phoenix supports that at the moment. You can still achieve this behavior by using a prefix name in your projects.
Ref: https://docs.arize.com/phoenix/deployment/deploying-phoenix#initialize-instrumentation