Hey Tam,
Thank you for reaching out! I hope you are doing well.
We’re aware of https://wordpress.org/plugins/duplicate-tec-event/ (third-party, not guaranteed or supported by us), but it doesn’t duplicate tickets, just the event. Our tickets are designed to be per-event, not reused throughout multiple events.
There are some other users that want to do the same and this has been already proposed as a feature in this UserVoice Page. Perhaps you can upvote the idea over there.
If you have any other questions at all please feel free to let me know and I’d be happy to help as best I can.
Juan