Take a piece of plain sawn wood and on the end of the board, mark out the quartersawn pieces you can cut out. You can typically find quartersawn wood in the center of a plain sawn board. On the edges of the plain sawn board, you will have to make angled cuts to extract the quartersawn wood.
Take the board to your table saw. Turn the angle of the blade to match the angle of the first angled line you marked on the wood. (Calipers can be used to help achieve the correct angle.) Make a second cut, following the next angled line, then make two more cuts on that angled-cut board to cut it into a square piece.