Hi Don -
Welcome to Router Forums!
Yes, the procedure you described is done often. I hope some of the real pros will add to my comments, but here's two cents: Be sure your fence is tall enough to provide a good surface to rotate down against. Put a piece of masking tape on your fence just above the width of the leg. Mark the position of both sides of the bit and put marks on the leg (or on tape on the leg) where you want the mortice to start and stop. Bring the leg down slowly and carefully between the marks and make your cut(s) using the marks to line up the beginning and end points.
You have found a great site with some really fine folks who are always willing to help you in any way they can. I hope you'll browse some of the threads to get an idea of the wide scope of things that are covered here. Log in regularly and join in. No doubt,
in time, you'll be able to contribute your ideas, too. It's a fun and informative group. Enjoy!
Roger
(Roefa)