Import to Hub
The Import to Hub stage is used to create a complex network of relationships called a hub, which can be displayed in a model. Once that model is created, it can be queried against in a Read From Hub stage or a Query Hub stage, or it can be visualized in the Relationship Analysis Client. You can also use the Import to Hub stage to populate an existing model.
A dataflow that uses an Import to Hub stage requires two incoming channels of data: one for entities and one for relationships. You'll then need to complete the Entities tab and the Relationships tab in the Import to Hub stage to complete your dataflow and create or update your model.