Refering to this post : How can copy object’s geometry to brush like in UDK? , i see that the old function that was present when i mapped for ut99 and Rune is now gone. Any other way to do it? What i want to do is cut a BSP box with a BSP cylinder so that the box has a half moon subtracted bsp into it.
I hope i was clear enough. 
Thank you kindly.