HOW TO ASSIGN A MULTIPLE TASKS

hii all,

i have a interface to request for Range Reset in retail organization , once the required details filled user going to submit the form here , for each RANGE RESET i have set of tasks to complete , whenever user clicks submit button 12 tasks should assign to 4 owners along with the task completion time lines , task owners are 

1.reset manger

2.assistant buyer

3.buye

4.merchandiser , how to achieve this , each should assign 3 tasks per head

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