Flatten data. Then you can use the Band Report Wizard
and bind the data directly to the report's DataSource property. On designing the report add a grouping
by field, this will add GroupHeader|FooterSection
in which you can place the repeating data (fields). The Detail section will repeat for each record in the group.
Then you can set the Detail section's visible property to false, and add a ToggleVisibilityAction
to an item in the GroupHeaderSection - the target will be the Detail section.
If data cannot be flatten, please check How to Databind to Collection Properties
and Use DataObject as a datasource for nested data items (Table, List, Crosstab, Graph).
The idea is that you can add a Table item displaying the sub set of data, even if it is not a collection property of the main object. The table item has its own DataSource and Filters properties.
The target of the ToggleVisibilityAction will be the Table item.
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