>>>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.

I guess you can add existing form doing following:
1. Open form you want to add and save it as AddForm class.
2. Open formset, Add AddForm class to objects and drag the icon to Form Designer.