This feature is available in all editions.
There are many backlogs in the system with existing data that I would like to update using by using the import feature. How can I do this?
Currently, Lifecycle does not have the ability to update the details of existing items using the import feature. You can, however, use the API/SDK to make these types of updates. It requires creating queries that you can run from the browser. To learn more, refer to Getting Started with the API.