customized grouping

I have a tabular report with several groupings.
I want to customize one of the groups.
For example I have a field called country. I want to group it by
region, western and eastern. How would I do this?where does the regional information come from? you need to provide us with
more info about your fields and their data.
"OogleGoogle" <Yvonhong@.gmail.com> wrote in message
news:1183576344.729726.5950@.i38g2000prf.googlegroups.com...
>I have a tabular report with several groupings.
> I want to customize one of the groups.
> For example I have a field called country. I want to group it by
> region, western and eastern. How would I do this?
>