Problem: Sharepoint out of the box only allows you to create Menus with a single Sub Menu within the navigation bar.
Menu –
| -Sub Menu
Solution: If you are looking for something like this.
Menu –
| -Sub Menu –
| -Sub Menu
1. Open the master page in SharePoint Designer.
2. Locate the SharePoint:ASPMenu within TopNavContainer. Or simply click the nav bar within the page.
3. Locate the property MaximumDynamicDisplayLevels=”1″
4. Change the value to something greater than 1, in this case we will change it to MaximumDynamicDisplayLevels=”2″
5. Save and Publish the changes.