I want to study graduate diploma level 7 in NZ how to apply

Hi, everyone asking in behalf of a friend I have a question if anyone can help me?
I have a bachelor’s degree in commerce for 4years and want to study graduate diploma level 7 in NZ, how to apply, and which universities and faculty you recommend?
Plz, help if you can

Kia Ora, good to know you are keen to pursue your higher education in New Zealand. It has eight universities, many Institutes of Technology and Polytechnics (ITPs) and Private Training Establishments (PTEs). You can expect to find good quality education here. There are numerous flexible programs that are provided by these institutions . The education system here will give you an exposure like never before as it comes with an international outlook. This prepares the students for employment here as well across the globe.