Customization in task series

We have 3-4 types of work order for bolting tools, some times it is in hour basis, shift basis, target wise or fixed amount. When we place the work order in system. It is fine. But while creating project of that work order, in task, we want that separation in series wise so that billing will be not easy as per counting of bolts. Any idea about this???

@PratibhaPatil Task series is not customizable as of now.