Thanks, Mouser, for your reply. For some reason, it didn't appear in my listing of unread posts, so I didn't see it until I poked around a bit this morning.
The screen shot I posted doesn't actually show the specific program node I was trying to delete. By the time I wrote my message, I had succeeded in getting rid of that node, using the rather cumbersome method I described in my first message. So I just chose a random part of my LBC listings as an example of what I was trying to do. And yes, like AnVir Task Manager, the node I wanted to delete was right below the parent node. But I thought I was pretty careful about indicating which node I wanted to delete. And, in any event, even if LBC had mistakenly thought I wanted to delete the parent node ("Very Useful"), why should it have wiped out ALL my nodes in all the different categories rather than just those few in "Very Useful"?