Hi,
I'm not quite sure how to explain this one but I'll give it a go...

I want all my products to have an attribute for delivery format with the options Email, Printed and CD. Email will be free of charge, Printed will add to the price and the weight and CD will add to the price and the weight too.

So far pretty straight forward.

Here's the bit I'm not sure how to do...

If a customers purchases more than 1 item all with the CD option I only want it to add the price and the weight for the first item as all items will be put onto 1 CD.

Does anyone have any idea if this is possible and how I would go about doing it?

Thanks