Hi Massimo, I somehow missed your comment. I think your approach is right in that it just needs an extension of the same technique to several duples. I am not too sure about creating separate tables, as it might be more work than just managing a single table for later updates. Yes one could do this with queries in Access indeed, and that might be an overkill if your dataset is rather small and infrequently updated. Good luck, if you haven’t already figured it out :)