I am now on the "Breakthrough I" tutorial in the WED Editor tutorial from the GS7 downloads page.
I created two small blocks, one to fit on the wall as an archway doorway entrance, and another to serve as a cutting tool to cut the first block in the shape of the archway. However, every time I finish cutting the first block in the archway shape I want it, I place it in the wall directly in front of where the archway in the house starts, and when I am ready to use Edit/CSG Subtract option, it is continually grayed out.
I found this in the tutorial:
"If CSG Subtract is greyed out, you've probably made a little mistake when shaping the block. Try again and make sure not to accidentally cut a 'notch' in your arch cutting tool. Otherwise it will automatically divided into a group - you'll see this in the editor - and then can't be used anymore for cutting doorways. Your wall however might be divided a bit, but so long as we don't go moving individual parts of it around we'll be okay. In any case, we won't be using the wall as a cutter."
I am confused as to what this is saying. How am I able to "cut a 'notch' in my arch cutting tool". I thought it is only able to cut the first block. How can the arch cutting tool be able to cut itself?