JE,
Thank you for the reply, and the fix. I tried it with the example
provided, as well as some of my regular data. It does work, however,
but it doesn't like the fact that there are blank cells within the
field ranges, and is unable to group them . "Cannot group that
selection" is the result. I take out the blanks, and it's fine. (The
sheet, still needs to have the blanks, as these rows contain other data
in other columns, so reformatting the sheet isn't an option.)
Do you have a "plan B"?

Thanks again.

Pierre