On arrival at AKL domestic you go landside. The transfer between terminals (by walking or by bus is outside), and check in for Malaysian will be landside. Then through immigration and security.

For GVA-AMS-KUL-AKL-WLG liquids rules apply at GVA, AMS and KUL. This means you can only get large duty free liquids at either KUL or on arrival at AKL. There is no liquids rule for domestic flights in NZ. In this direction you will not be able to check duty free liquids other than on the AKL-WLG leg but no point. 1 bag of duty free bottles + a carry on is okay for the AKL-WLG flight.