Woolworths NZ require very specific pricing to be provided in the National Product Catalogue. Please review the below document which explains exactly how pricing should be loaded. Please ensure you have discussed and agreed upon pricing with your buyer before loading that price to the NPC.
Often the source of agreed pricing is something called the "Supplier Deal Proposal" [excel template] this originates from Woolworths NZ and is completed by the Supplier.
It's the best place to start if you are not sure what fields and amounts to enter.
Don't try to understand all the intricacies of the pricing scenarios, just use the
Woolworths NZ Pricing Guide
Pricing on NPC is GST Exclusive.