Linking items with Buildings?

I have a Shop that sells items but how do I pick what items it sells ect.? Also, in the Unit Editor I try to change the icons for some items but when I clock OK it's still the same icon? Help?anyone?

Ok i figured out how to Add new items to my shop, but can anyone please tell me how to successfully change the icon an item uses?

You simply make a new custom unit...go to the that says units and scroll down to items. pick the image u want and then start editing it...it shouldnt be to hard to find.

So i can't change the icon of an already existing item?

yea u can im sure

Does anyone know how plz? :/

Don't change the model, change the interface icon.