If after the quick dummy import you see the menu sections empty:

Instead of :

You have to replace the demo menu items' ID-s with yours (if you wish to have the same page design) 

You can get your ID-s in Dashboard > Menu items > Meal Type / Dish Type / Menu Items

and for the menu items ID-s:

You can also re-build the menu pages following this guide: Guide to FoodPress plugin - VIP Restaurant Wordpress Theme