Adding windows to a curved wall

[DarkEvilPhoenix]

I know this has been asked before, but I can not find the thread. So can someone please help me on how to add windows to a curved wall. I have a wall in my plan that has an arc extent of 160 degrees and am having trouble putting windows into it. And advise would be helpful thank you.

[hansmex]

1 - Insert an invisible box (import as door/window)
2 - using keyboard arrows insert your door/window

H