When I tried to do this I got an error message that read “No data was found in the specified file for the Property ‘Strata’ ” (when trying to import into the Strata property). I used the ‘Update and Append’ choice. I tried this again with a blank database and got the same error message.
I was able to import new strata from an individual property export using the Update and Append option as long as the Abbreviation and Name attributes were unique. It would be neat if the import process could ignore duplicates (or truly update them) and then append any new records. Maybe it does and I’m just doing it wrong. It wouldn’t be the first time.
[EDIT] The process (comprehensive Export/Individual property import) works for importing Deterministic Transitions once the new strata are added