In your case, you are gone extreme of using sub-level menu. Navigation that are specific and do not overlap are the easiest to understand. This cuts both ways: In deep hierarchies, when there are only a few navigation categories on each level, they tend to be more generic and, thus, more confusing. A flatter hierarchy with more navigation categories at each level usually has more-specific labels that are easier to understand; but in broad hierarchies with a very large number of items, there is often some conceptual overlap between at least a few of the navigation categories. Users can also become overwhelmed with long, cluttered menus.
I would suggest to reconsider your IA and use given below methods: