This is a time intensive Toolkit function that rolls up the costs from the resource all the way up to the main work order. This is different from the Recalculate Work Order Costs from Tasks function as that function only updates the work order costs. It does not recalculate the resource costs and roll them up to the task as this option does. This option will work on the current filterset.
Note: This Toolkit option may take substantial time to process. If you only need to update the main work order costs and not the task and resource costs, use the Recalculate Work Order Costs from Tasks option instead.