Specifies the labor rate in effect, which defaults to the billable rate for the user that the task is assigned to. (This can be modified in the Case using the Hourly Rates section).

Using these fields you can separate the cost of labor vs. the cost of travel, if you separate the two.

You can override this rate by clicking the Override button to the right of the Labor Rate field.

This will use the override rate and the Labor Time when calculating the total cost.