How to create a calculated field for displaying "Column names in the Subtotal" label.

How to create a calculated field for displaying "Column names in the SUbtotal" lable.

I want the "total" to be displayed as [DataFeedDesc][Policy Number][Total]

Example:Test1:Test2013TLP00479 Total:

The following is the calculation i created but i didn't use it

{ FIXED [Policy Number]:SUM([Total Premium])}