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I do this all the time. Mostly with spells and mechanics articles. You simply bulk tag the articles you want to migrate with the export tag. Do the export. Then import into the new realm. It is pretty painless.
On thing that would make it more painless, is to have a realm with nothing but monsters, spells, and other articles that are not campaign specific. That way you can just export the entire realm and import it into a new realm.
But I only have a couple realms and I'm generally just running one, so I just manually select the articles from previous realms that I want to move into a new realm when I'm setting up a new campaign.