Assigning the processor role dynamically

Hello,

I am creating a GP using Webdynpro for GP Interface Callable Object in which the initiator fills out certain details like issue ,ticket no...using the webdynpro view...which has a dropdown also for module ...based on the module selected in the dropdown the workitem should go for approval in the UWL for the corresponding lead of the module....and not to all the processors of the action....how can I achieve this dynamically....?

Any help would be highly appreciated.

Regards,

Anil