Hi Marco,
I think this may be what you're looking for, in particular the sections "Resynchronizing Level Attributes" and "MS_LEVEL_AUTO_SYNC_ATTRIBUTE_LIST":
communities.bentley.com/.../overriding-and-resynchronizing-level-attributes
While this isn't an area I'm all that familiar with, based on the content perhaps you wouldn't need to actually batch process anything other than opening the DGN files.
I think this may be what you're looking for, in particular the sections "Resynchronizing Level Attributes" and "MS_LEVEL_AUTO_SYNC_ATTRIBUTE_LIST":
communities.bentley.com/.../overriding-and-resynchronizing-level-attributes
While this isn't an area I'm all that familiar with, based on the content perhaps you wouldn't need to actually batch process anything other than opening the DGN files.