I can do a roll up of time estimates per assignee when there is just one assignee (group by assignee function) however, as soon as there is multiple (i.e. Steve 2hrs, Tina 3hrs and George 4hrs) it groups by the assignee group not individual. therefore I cannot see the total time estimate for only Steve on my list project. When project monitoring this is really critical to see how much time is needed from them across the project as a whole. AND for allocated costs (billable time) on a project, to see how on track I am. SO simple in Excel yet so hard here.