Hi @VLY ,
If I understand correctly, do you mean you want to remove the entry list you have deployed previously without clearing the user's own values? If this is the case, from what I am aware of, I am afraid it's not feasible with GPO. As an alternative, I'd suggest trying to remove the entry list using the Set-MailboxJunkEmailConfiguration powershell cmdlt as it allows to remove entries without affecting the existing entries:
See this link for reference.
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