How to Create Custom Usage Decisions

Hi,

I am working in ECC 6.0. I want to create a Custom Usage decision (Plant Specific). I can not remember where to go to set this up?

If I use transaction QS41 and set up my own Code Group under Catalog type 3 (Usage Decision), where can I attach the Selected Set that tells the system how to post the Usage Decision (i.e. Unrestricted, Restricted, Scrap...)

Any help with this would be huge.

Thanks so much,

-Bruce