Hi Bala,
What version are you on. This sounds a similar requirement i came across in past.
Tried on wM9.8 and i am able to update the status as desired on selected tasks.
Issue with having bulk resubmission is when the task is associated with Process. Process flow will have dependencies on the outcome of task (business data update). Basically user logs in to the task update the options and the workflow will be decided.
Good practice is to have a custom logic which does the bulk updates by setting necessary business data.
#webMethods-BPMS#MWS-CAF-Task-Engine#webMethods