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You can add lookup columns to Site Collection parent site and have it reflect as lookup within child sites by creating the site column as lookup. But cross site collection, it is not possible OOTB. There are 3rd party solutions available if you search for "Sharepoint 2007 Cross Site lookup".


You can use SPServices to achieve this: https://spservices.codeplex.com/wikipage?title=%24%28%29.SPServices.SPCascadeDropdowns $().SPServices.SPCascadeDropdowns({ relationshipWebURL: "", relationshipList: "", relationshipListParentColumn: "", relationshipListChildColumn: "", relationshipListSortColumn: "", parentColumn: "", childColumn: "", ...

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