Discounts dependant on attributes

[lazerradial2003]

I'm curently building my second Zen Cart site and this one is for a Photographer. Their current pricing structure (which they want to keep!) is this:

The First A5 Print is £8, Each additional A5 print (of any photo) is £5

An A4 Print is £10, Each additional A4 Print (of any Photo) is £7.

An A3 Print is £25, a second copy of the same print is £20 .

A Fridge Magnet of any photo is £3.50

A Key Ring is £5 (can have the same image on both sides or a different image on each side.

And I'm trying to come up with a way of doing this using Zen Cart. Idealy each photo taken would be one product (instead of having a new product for A4Prints, A5 Prints etc) And then the format they wish to buy the photo in would be selectable by attributes.

My problem is that I need to be able to apply quantity discounts based on the number of products with a particular attribute that are purchased (For example buying Two A5's of the same image and a key ring of it should price at £8 + £5 fo the two A5's and £5 for the key ring).

Furthermore if someone buys one picture with "Key Ring - Same Picture Both Sides" as the format then they would be charged £5 but if someone orders two pictures with "Key Ring Side 1" for one and "KEy Ring Side 2" for the other they should be charged £5 for both!

I would be very appreciative of any suggestions on how to do this or how to change the pricing structure to make it more doable (the structure must look appealign aswel because the same one has to be used selling photos on a stand on the day they are taken!)

[lazerradial2003]

Update on my problem, apparently, when a discount is set up on an individual product, there is an option to only apply that discount when the same product is ordered with the same attributes selected.

This is exactly what i want to do but i want to use it with the quantity discounts modification so that i can apply the discount to entire categories. So that if any two products are ordered from a category with the same attributes selected then a discount will be applied. Any suggestions really appreciated, my site is so close to being ready to go live!