how to cut a brush into a main one?

Hey all,

i have created a hollow box with a door for my new rp map but i need a window is there any way i can create the window brush and put it where i want it in the wall and like cut it some how like in the qeradiant editor??

thanks

Select the brush you want to be the window, and then hit carve. Althought you don't want to use this method at all, its better to build by brush, or use the clip tool to create the window. Hammer doesnt make good use of csg as well as the radiant editor does, so I recomend staying away from it.