I'm not 100% sure on this, but I believe you would need to apply for a Long Term Business Visa to be able to run a business in NZ if you don't already have PR. I say this because many people have expressed a wish to open a business and, if it was as easy as holding a WP, I'm sure they'd all be doing it. Once you have PR I think you can more or less do what you like.
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Mother Bear
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