>>what about adding a form that already exist to a form set,
>May be I don't get it, do you mean to add existing form to another existing formset at the runtime? If not, what about adding new empty form and copying all the controls from your source form?
Thanks again Nick, Yes I mean that, but not at run time, I am talking
at developing time. You idea works, I just don't understand why this
is not posible, why I can't add a form that already exist to an existing
form set ?. I have a lot of screens and screens sets that I need
to convert to forms and forms set from the previous version of Fox.

Thanks again for your help Nick.