Attached you can find example project with nested sub reports in 3 levels using business objects as data. The sample data are:
The names are different but the hierarchy is similar to your request.
The main report is bound to Companies. All sub reports are unbound (DataSource property is not set). We use the NeedDataSource event of the SubReport item to set data for the sub report. Please take a look at how we get the instance of the business objects from the DataRowView.
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