how to duplicate child-note to other item in another group

I could find no documentation on this problem:
I created an entry in my main library, then I copied this entry into a group. Now I added some notes to this entry in my main library, and I want these notes added to the the entry in the group library as well. The only way to do this, it seems to me is to delete the entry in the group library, and then copy the item again (with all child items).
Is there a less cumbersome way out of this? Specifically this is a problem if a group member has already added other notes to the group item.
It would help if one could simply ctrl-copy notes and then insert them onb group items.
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