First time I've used the sheet metal feature in SW, and I'm running into a problem.  I need to make a flange that drops down between two other flanges, but I can't figure out how to do it without causing overlapping solids in my model.  I know there's a way to do it, but I just can't seem to figure it out.  Any takers? I attached a snip from the screen to better illustrate my problem.I need to drop a flange from the top down between the two outer flanges,