Official or not, you're right. I've just now tried to make a hole in a log wall using my original idea,[ adding and subtract ing solids],and it worked. What I was doing wrong before, I'll never know.
So, the "simple" solution will work. The major drawback of this method is when changing the locations or deleting doors and windows,you would be left with a hole in the wall, which I suppose would require replacing the whole wall and starting over. Not a simple solution.
I have posted a "wish" for the addition of a couple of new "wall styles".
Thanks Andrew, for your input. Nothing like someone who knows what they're doing.I am still in the " trying to know " stage.