Hi JA, As I understand from your post, the architectural and structural models were imported merged, as a single external source. Therefore synchronizing will refresh all the models from this external source. If you want to update just part of this source, I believe the only way is to set it up in the original import software. Otherwise, you'll have to do something more manual by deleting the objects you want to update, importing the new structural model and deleting everything but the updated objects. Hope that makes sense. Cheers
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