I think the form size is just the way the form area (number of cells) gets
displays on the screen and the print area. I have taken forms and made the
large by copying row and adding to end of the form and then change the print
area. I don't think you should be worrying about the size.

"l" wrote:

Thanks a lot

but what about the user form for data input?

As far as i understood, the Form has always the same shape/dimension,
while in my head the form has to present just the number of fields
needed once the user select the triggering number in A1. The form
could also have all the fields visible, but it's important that only
the needed ones are editable.
thanks