Enter cost information for resource assignments

Choose Project, Activities.
Select the activity whose costs you want to enter.
Display Activity Details, then click the Resources tab.
To enter the budgeted or planned cost for the activity, type the value in the Budgeted or Planned Cost column.

To enter the actual cost for the activity, type the value in the Actual Cost column.

To enter the remaining cost for the activity, type the value in the Remaining Cost column. You can only enter remaining cost for activities that are in progress.

Notes

When you enter an actual cost on an activity that is not in progress, and the Cost Units Linked checkbox is not marked on the assignment, the budgeted or planned cost and remaining cost will not be linked.
The budgeted or planned cost will remain untouched and the remaining cost will change. To maintain the same value for the at completion cost, set the When Updating Actual Units or Cost option (found on the Calculations tab in the Project details) to Subtract Actual from At Completion.