Hi Brian,
Again, thanks for responding on the weekend!
Also, thanks for revealing how to edit an existing form - your approach works. I (foolishly) "read the manual" which apparently is very wrong. The instructions in modifying_custom_form.pdf say that after selecting the form you should again select Insert | WebAssist| CSS Form Builder | Insert Form which does *not* open up to edit the existing form!
Thanks again for answering so quickly.
Jim