How would you have done it?

I like that idea. There are few differences between a pizza and a sub in the class list. I am still left wondering though, is it a bad idea to use a List in which each pizza has a list ? is there a more optimal way to perform such a task?

well my friend,

i would recommend you to build an abstract class called Product, all Products sold will inherit from it, then you will be able to hold a List of Products

and in order to add new Product you wont need to make sure they have the basics only the different Properties.

this will make your code much more organized, and make the ability to add new Products or Update the Basics or a specific Product will be easier.

Dear friend ,

We can build DLL no matter how much the messy code :)

but if you having small software its ok that you use class wise development but

if software is some what big Better to build DLL's for each Module of Software so that in future we can manage it properly :)