Thank you, yes, as you pointed out, it does work.
Since I first posted, I continued to fuss around with it and I did figure out the following: this kind of duplicating and renaming of subclips only works if you do it from the clip preview window. It does not work if you duplicate clips from the sequence (either in timeline or storyboard mode). What is confusing is that from the sequence, you can duplicate clips and it will let you rename them, but it won't remember the new names, only the Ins and Outs you chose for each duplicate.
I'm now going through and doing it all over, but from within cip preview, and under the Clips tab.
Thank you for your response, and I hope my mistake will help others getting started on this software.
UPM