dynamically varying the layout in smartforms.

There is a critical requirement in which the layout of the smartform has to be changed dynamically . i.e . a pop-up opens listing all the fields used in the smartform . then , depending upon the user choices , the chosen fields are displayed in the smartform . now here , the chosen fields have to be dynamically alligned in the displayed version of the smartform. is it possible and how to go for it.

ps : reward points are guranteed.