@JeannieN Here is a use case for pipeline cloning.
We use the pipeline feature to manage events. We create a temporary pipeline prior to events and use it as a temporary lead management tool where stages are pre-event, during event and postevent. Once the event is done and all real opportunities are transferred to our main pipeline, we kill that pipeline.
We are open to use other features to manage the events we go to, but so far, this is the best way we found so far and the team really enjoys it as it gets them focused in these fast paced clients meeting events.