Getting ABN holder discount on a new car

I have a really strong understanding of tax but not of how ABN discounts work on new vehicle sales. I have an ABN as a sole trader for work that I've done in previous years. I am NOT looking to claim GST or other tax deductions other than % logbook KM for my current salary job.

What I am hoping to do is take advantage of ABN pricing on the purchase price only of a vehicle. The ABN is in my personal name so if I were to provide that to the dealer, would it make the vehicle commercially registered or can I still get it personally registered and have no impacts other than the purchase discount?

I'm sure it's a simple answer but I couldn't find it. All articles on it are explaining how to claim GST, etc. which I'm not planning to do.