Thanks for the screenshot, that explains a lot ;)
If I'm correct, you're talking about the Form Builder Module for Sitefinity 3.7, that was created by Falafel. You posted your question on the Sitefinity 4.x and up forum, so that won't work.
I don't know if you also have the source code of this Form Builder module, but if you have, you have to change it to fit your needs. If I remember correctly there is no such functionality built into that module.
If you don't have the source, you should see if you could reach Falafel software and ask them your question.