is the country field in the subreport(s) or the main report?
if it is in the main report, I would think that you could just build a group on the country code. The part about the 0 is for filtering your data, not displaying it.
If the value is in a subreport...I don't know how i would attack the problem. Somehow, you would want to get the country, but you would need it from every subreport which is non-deterministic (at least to the main report), so I don't believe it could be done.
This is just the first thought, as I don't know the report or the data.