You can convert entities from one database to another. For example, you can convert a Feature entity into a Bug. This feature is useful when a Feature needs to be reclassified as a Bug without losing any data.
Note: The original entity is not deleted when you convert it. Convert action creates a new entity in the target database and keeps the original intact, so nothing is lost. You can review both side by side, manually move over anything that didn't carry across, and delete the original yourself when you're ready.