editing multiple phonebooks?

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http://androidforums.com – are there apps which alow to manage/edit multiple phonebooks and load each, as necessary? for example, if I travel overseas, I want to store beforehand a set of useful phone numbers, but I dont need them back home. so can I create an "overseas" phonebook, and load it, and only it, while travelling, and then restore the "normal" phonebook when I've returned? I saw the CWM7 has an import/export function, would importing contacts add them to existing ones, or will the phone show only the imported contacts? do I have to "load" the phonebook I want to edit, or I can (General)