propeller,
what i meant was a discontinuity BEFORE CF. to accomplish this, you select a waypoint before CF to the top then DELETE that waypoint. the result will be a discontinuity from present position to CF. come to think of it, i'm now not too sure if you are able to do that with the Smith's FMC (B737), it had been awhile since...
BmP, looks like from the experiment of Phoenix & Propeller, it seems like my assumption was wrong.
HS