How to clear contents in some field in one time?

For some reason, I want to to clear all contents in 'Extra'. Are there any methods to achieve it?
  • For all items? And what exactly is your goal/purpose here?
  • I am using extension ' Zotero Scholar Citations', and I want to clear all contents in Extra before fetch data from Google Scholar.
  • That’s not really necessary—that plugin will add the number of citations to the top of Extra, before any existing contents.

    I would recommend leaving Extra alone here—it’s used to store some important data sometimes (e.g., DOI names for book chapters). It’s possible to clear Extra for all items, and I could walk you through that if you want, but I’d advise against it in this case.
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