Subreport or multiple data sets?

Hi guys, the title says it all really. I have a main query which returns 5 Input Groups, each input group can have multiple Voting Groups, each voting group can have multiple Voting Setpoints and each Voting Setpoint can have multiple Inputs. Should I use reports inside reports inside reports, or can i achieve this with a main report and multiple datasets in some way?  Obviously I don't want blank areas where (for example) Set points do not exist So you have Input Group > Voting Group > Inputs

An example structure could be:

- Input Group 1
      - Voting Group 1
            - Voting Setpoint 1
                    - Input ID's
             - Voting Setpoint 2
      - Voting Group 2
- Input Group 2

Thanks,
Dean