Discount for a collection of products

[websharky]

Hello.

- zen cart 1.3.8
- upgraded 24 of July, 2009 from 1.3.7 to 1.3.8
- Admin Profiles and Ceon URI Mapping (SEO) addons installed
- I have looked for any addons, but have not found relevant

I've made a new category "Items on Sale" with several numbers of manufacturers. How can I "in one touch" remove some products in that category whose year of production = 2001, for example and apply 10% discount? Is it possible on the whole?

Thank you for answer.

[websharky]

Now thought? No in-built solutions? No add ons?
Oh, god... I will have to code it myself :)