Import only tag or other meta data about a document

Hello,

I need some help to do an mass operation on my Zotero library.

I would like to export my library, to work on its on Excel (or an other software), then re-import the new information (for exemple new tags), and link these to the old document.
But I don't achieve to re-import and link new information to the old document item of my library. Zotero create new items.

Does someone knows how to do this ?

Thank you !

Theodore
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