If this box is checked, when you change % complete Actual Costs are automatically calculated as Cost times %C. This setting only applies to edits that happen after this box is checked.
If this box is checked, when you change % complete Rem. Duration is automatically calculated as Duration times %C. This setting only applies to edits that happen after this box is checked.
Manually - The default. If this is selected you must click the Calculate Dependencies button in the Schedules Gantt Chart Toolbar or use one of the "Correct dependencies" commands on the context menu in the chart in order to calculate the schedule. (See Interacting with the Gantt Chart for information about the context menu.)
Auto - If this is selected the schedule is automatically recalculated as edits to the schedule warrant.
Ask - If this is selected the user is prompted in a dialog each time edits to the schedule warrant a recalculation.