Can a Form Action transfer to another file that is a form?

I have a script file that is both the form and action handle (using isset), which is a menu selection. If the action handler is executing it is a switch statement that will chose the next form. I would like to transfer to another script file that is also a combination form and handler. Can I do this without using a redirect? I have no need to bounce back to the user's browser. Or should I just separate my forms and their action handlers? Thanks Stephen