The Report Definition in Management Reporter has options that allow you to round the entire report to options such as whole dollars, thousands, millions and more. But sometimes you don't want an entire report rounded, you want a specific row or column rounded. You can accomplish this with Custom format overrides.
In the example, there are four rows, and each one has a different custom format override applied to it. The comma is used for scaling and allows the single row to round to that amount.
When you generate the report, the rows with the rounding applied using the custom format override will show appropriately.
For ideas and information on how you can create custom format overrides visit http://msdn.microsoft.com/en-us/library/0c899ak8(v=vs.110).aspx