Workfront should allow aggregations on calculated fields in a report (or any other column in a list view). For example, right now, if three people are assigned to a task, you can aggregate the cost of their labor based on their role cost per hour or user cost per hour. But in many consulting firms, users work across multiple roles and make a percentage of the billing rate for that role on that work. Right now, there is no way within Workfront to aggregate labor cost for tasks assigned to multiple people that may be making different percentages of the billable rate.