You can easily clone the Test scenario.
Step 1. Open the original Test scenario > click on 'More' drop-down button from grid and 'clone' option. You can change the summary if you wish and click 'create' button to create the clone.
Step 2 : Observe the link of original Test scenarios under 'Issue Link' section.
- Cloned test scenarios does not include associated 'Action Steps' of original Test scenario. But you can search and associate the Action steps to cloned Test scenario.
Here is the link to help documentation.