1- Add a main category ( make sure main category id = 1 ).
2- Add sub categories to the main category.
3- Categories and their subs will be displayed automatically in menu.
- In case you want to pass the category Id to the screen, make sure to add an input named "ItemId" .
- To delete a category you need to delete all it's subs
- A standard CSS is implemented and it's fully customisable