Hi,
wouldn't the "combine with default culture" setting do what you need without creating a copy into a different culture?
![Image Text](https://content.screencast.com/users/DavidTK/folders/Jing/media/5435fb76-500f-4308-94eb-0dc3fd4b5b31/2019-02-25_1424.png)
If you need it, or have different logic you could also check the "SaveVersion" event and just check the PublishFrom value. (docs.kentico.com/.../#Reference-Globalsystemevents-WorkflowEvents)