Is a filtered import possible with the current interface?

No. All issues of the selected type in the JIRA project are imported and all top-level items in the Codebeamer tracker are exported. There are currently no plans to support such a filtered synchronization.

Is importing one JIRA element into several trackers in different Codebeamer projects allowed?

No. You can associate one JIRA project and issue type with exactly one Codebeamer tracker at any time.

Once associated, you can only re-assign a JIRA project and issue type to a different tracker after removing the JIRA synchronization from the previously assigned project and tracker.

The reason for this is issue links. If you import a JIRA issue that has links to JIRA issues of other types or in other projects, Codebeamer will check if the referenced issues have already been imported. If yes, Codebeamer will create appropriate tracker item associations between the imported items and the previously imported referenced items. If we would allow importing the same JIRA issues multiple times into different trackers, then the mapping of referenced JIRA issues to the imported Codebeamer tracker item would become ambiguous.

What happens if a Codebeamer tracker item which is synchronized with a JIRA issue is deleted?

The tracker item still exists, but it is in the trash. The JIRA synchronization will continue importing relevant modifications of the associated JIRA issue to the tracker item in the trash. When the tracker item is later restored, it is still in sync with the JIRA issue.

What happens if an issue in JIRA which is synchronized with Codebeamer is deleted?

JIRA issues are deleted physically, so there is no trace left of them. On a subsequent import, Codebeamer is not informed about the issue deletion so the Codebeamer tracker item persists.

Only when Codebeamer tries to synchronize changes made in Codebeamer back to JIRA will it detect that the target JIRA issue does not exist anymore. In this case: the JIRA synchronization status of the tracker item will be cleared including the JIRA Key. To prevent future synchronization attempts for this item that will fail, the JIRA ID of the item will be set to 0 (zero).

What happens if a JIRA project is deleted which has issue types that are synchronized with Codebeamer?

The next JIRA synchronization of all Codebeamer trackers associated with issue types in the deleted JIRA project will fail. If this was an automatic periodic synchronization, any further synchronizations for this tracker will be cancelled. A tracker administrator must decide how to continue, but the only thing that they can do is to remove the synchronization with the deleted JIRA project.