Multiple "Notes" Fields | Feature Request – or – how can it be done?

We really need custom fields. Duplication of the ‘notes’ field would be fantastic for this. For example;

Notes=”Notes”

Notes1=”Attending clients”

Notes2=”Dietary Requirements”

They are just an example; they can changed for any situation.

Is it possible to implement this with code changes? If not it would be a relatively simplistic way to add this functionality (forgive me if this is too simplified but I’d assume it could be done with copying and pasting parts of the code).