Where's the code that Creates Orders?

[haphazardlynamed]

I was looking at the way Orders work, and I see that they have a lot of redundant information that is already contained in the Customers table

does anyone know the purpose of such redundancy?

 

I wanted each of my Orders to additionally have an associated 'StudentID' (my store is for a college campus)

and wasnt quite sure If i should make this also be on each Order like the other customer info is, or if i should just do a table join with customers

 

at any rate, id like to know where the Insertion code for Orders and Customers are located, since im going to need to alter them...

 

thanks