buildings give experience

easy question:

what is the value in the object editor that gives a killing unit experience

replies are greatly appreciated

It's Not! Go to Game Constants. There will be a Constant I beleive near the top that's labeled Buildings give experiance. By default that's False just change it to true. Normally Exp given is Defined in Constants as well so you should mess with the tables if you care to.

The value you alter is the level of the unit\building. To work with the exact details, you need to do what Mystic said and go to game constants.