Task to Notification

Dear friends,

I want to add task to notification and remove task from the notification. In this situation my problem is while adding it allows same task multiple times. In case of deletion it is deleting all the tasks matching the selection . I want to delete particular task only.

Ex . while adding i am adding 010 , 011 , 012 , 010 , 014....

in this if i am trying to delete ' 010 '. All ' 010' s are getting deleted. It should not happen like that . i want to delete that on the basis of task sort number. If so how to do it and while adding task how to add that task sort number to it . ?

If u can help , i am so thankful .

Regards,

Krishna