:censored:
I believe there is a classlabel for this.
Something like "destructableprop" or something. Just search around the stock ODF's and you should find what you are looking for.
Simple, change the label from "prop" to "destructablebuilding" and add a MaxHealth line and a DestroyedGeometry line, look in the Common folder at the health and ammo droids. Just put "" as destroyed geometry