Create A Page Tree

Hi I want to create a vendor guide, on how they can manage admin, products etc etc

so I need to create a page tree so we have something like this, how do I create a webpage so the breadcrumb will be for example

supplier guide > product information > how to update product information

at the moment I'm creating each page > parent page > root level directory

Product information

How to update product information

Pricing and inventory

product Extras

Product SEO + Google snippets

Quantity Discounts

Product Completion

Adding Features/ FAQ Ingredients

So why you do not select correct parent for subpages?