Select the Window or Door with the normal Selection tool.
Click on the reference point so that it's stuck to the cursor.
Move the window/door to another wall.
When you get to the other wall, hold the "Ctrl" key and click on the wall (bottom area works best, if in Iso view).
The window/door should drop into the wall and possibly rotate, if necessary.
Hope this works for you.
Designer, Deluxe, Expert, Basic, Platinum
Windows 10, 64-bit