Navigation Level Limits

Your theme is able to create nested menus up to 3 levels deep - the Shopify admin area's limit - from a single page by using the menu editing interface.

Here is more information on how to do this: Shopify Help - Drop-down Menus​

There is also the option of using the mega menu feature which increases your layout options. More information is available on this towards the bottom of this page, along with a useful tutorial video:

Apps:

You also have the option of adding additional functionality, via the use of an app, to display additional layers of navigation such as:

​Globo Mega Menu - Shopify apps Buddha Mega Menu - Shopify apps Meteor Mega Menus - Shopify apps​