Admin User Name:- admin
Admin password :- admin@123
No core files needs to be changed.
Just mouse over the All Categories tab. This will list the all Parent Categories on first level.
When you mouse over the first level. That will show up the subcategories. and further their subcategories.
Basically 3 level Menu flyer.
If you have any doubt or enhancement. Please discuss on comments.
We will provide you full support.