Derive new column in webi report.

Hi

I have a requirement where i need to add a column in the new column in the webi report. This column has name target.

Now based on another column called "No. Of reports" in the webi it should fetch the data.

E.g. If the No . of  Reports is > 5, then  the target column should show as GREEN colour( radio button or some indication).

If the No . of  Reports is < 5, then  the target column should show as RED colour( radio button or some indication).

Is this possible? Please provide some hints to achieve this...

Thanks

Pallavi