General Tidy up of SQL database and also some fairly lightweight modifications

Avg Bid (USD)
Project Budget (USD)
$50 - $150

Project Description:
I have a cart already set up and functioning fine.

However, i would like the SQL database tidying up in the attributes section (if possible) as several products would have been removed from the database via the Product_ID which would have also had attributes associated with them.


I would like a couple of fairly trivial mods,

1.) I need another subtotal module which would display a price of the current sub total minus the discount, EG
Subtotal: xxx
Delivery: xxx
Discount: xxx
Subtotal - discount: xxx
VAT: xxx
Total: xxx

2.) I would like to have a feature (if it's possible) that will let the customer insert their comments at the start of an order, but that also leaves it intact in the checkout section. Ideally this would be a mandatory feature so the customer would not be able to add any items to their quote unless they add some notes.

Skills required:
MySQL, PHP, Zen Cart
About the employer:
Public Clarification Board
Bids are hidden by the project creator. Log in as the employer to view bids or to bid on this project.
You will not be able to bid on this project if you are not qualified in one of the job categories. To see your qualifications click here.

$ 185
in 3 days
$ 60
in 6 days
$ 110
in 4 days
Hire techwelfare
$ 150
in 6 days
$ 150
in 3 days
$ 120
in 3 days
$ 53
in 1 days
$ 180
in 10 days
Hire binhtq
$ 150
in 3 days
$ 90
in 3 days