@Sue_ - you could possibly do it with Merge Books. When Updated Book is Master copied to the His and Her libraries they would need to have the Preferences->Adding Books->Automerge Duplicates set to unchecked
You'd probably need to edit the old book and new book metadata to empty the values you don't want and then do the merge
I don't think there is any way to pick and choose which metadata columns come from which duplicate. I have a vague memory of someone saying they were working on a fork to do it - but that was a while back.
If the frequency/volume of changes to the Master are low then it might be easier to do the changes twice - on the His and Her Libraries.
BR
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