Hi Don,
You would have to reassign the items from the unwanted department and category to the correct department and category. Then delete the department and category if it’s no longer needed, purge NSc Sync’s cache and synchronize. If there are other items in the unwanted category then you would have to reassign those beforee you delete the department and category. Details on how to purge NSc Sync’s cache can be found below - How do I purge cache on Nsc Sync?
Let me know if you have any problems and I’d be more than happy to give an call and get the issue sorted for you.
Regards,
Vito