A report template can be loaded, rendered, and serialized to JSON — the basis for saving templates that users have edited.

Load, render, serialize.
Report = new StiReport();
Report.Load("Reports/TwoSimpleLists.mrt");
Report.Render(false);

// Serialize the template for storage
var reportJSON = Report.SaveToJsonString();

How it works. The template round-trips through JSON, so an edited report can be persisted to a database or file and restored on demand.
На скриншоте ниже Вы можете увидеть результат выполнения данного кода:

Loading and Saving a Report Template