A master report can host sub-reports that pull their own data, so a complex document is composed from independent templates.

Load the master report. Its sub-report components reference the nested templates; loading the master renders the whole composition:
var report = new StiReport();
report.Load(AssetLoader.Open(new Uri("avares://…/SimpleList.mrt")));
report.CalculationMode = StiCalculationMode.Interpretation;

How it works. Each sub-report renders in the context of the master's current row, producing master-detail output from separately maintained templates.

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