I haven't really played with it enough to understand all the ins and outs, but here's the way I understand it:
Basically, I think I misspoke. It seems that the cell named "Family" isn't necessary at all. I've tried it without that name, and the configurations seem to work. Still, when SW autocreates a DT, the corner cell is named "Family".
If you look in the help, under "Formatting a Design Table", it says that the cell that marks the beginning of the data is named "Family", which by default is A2. I guess "the intersection of the row and the column" isn't a very good way of saying it, but I mean basically the upper left corner of the DT data block.
The help seems to imply that what I wrote is correct, but in practice, it looks like naming the cell is not really necessary.
The thanks for this really belongs to a bunch of people from this ng who responded to my request for information and examples, I just put it in a format I could present at a user group meeting.
"Kman" wrote in news:3Gkhc.16939$ email@example.com: