After analysing the market, you might decide to restructure the work into separate lots and publish a tender with multiple subcategories. You should then indicate in your Notice of Procurement that you might award the procurement in separate lots.
Restructuring large contracts into smaller lots can be helpful for small New Zealand businesses that may not be able to compete for one large contract. For instance, instead of choosing one national supplier, you could split a contract by region and contract with multiple small regional businesses. However, you cannot split a procurement with the intent to avoid applying the Rules.