Well, there's one way, which I've just tried. But there may be a much
shorter one. Open a blank document in Word. Type in your wanted expression
(with a leading space?). Save it as say fred (as long as there isn't another
fred file!). Then in your main document, at each wanted point type ALT-I, l,
(that's Insert, file) fred. But here must be a quicker and easier way.
Stand by.