There is no real process for upgrading a translation for a new version.
The refset is the scope definition for the translation. The typical case for handling a new version would be to include the "new" concepts in that version in the refset so they would become available for translation.
So the process would look something like this:
- find the "new" concepts in the new version of SNOMED
- Edit the refset that goes with the translation
- update the version to the new version
- add the "new" concepts (e.g. using the list control)
- Then these concepts would show up as "available" for editing in translation