If you want to have a section broken down into even more subsections the main navigation can utilise three tiers.
This will make it easier for people to find the information that they are looking for – plus you can see all the sub pages and sub, sub pages by simply rolling over the main navigation. This way people can find the page they are looking for and get to it very quickly!
These are easy to add, or remove, meaning the site can always be kept up to date with your business and it’s offerings.