To Update the Task Status Method of your project you can either go to menu File – Options – Schedule Tab and change the methos from the Task Status Method field. Or, if you have the default Tasks Status Method set for your project and you edit the Deadline or Max Cost field in the menu Project – Project Information, a dialog will be displayed proposing to update the Task Status method from the default “% Complete and Status Date” to “Deadline and Max Cost” method and set Max Cost custom field.