This allows to establish hierarchy of outline nodes for data-bound render object. For instance, the following code: C1PrintDocument doc = new C1PrintDocument(); RenderTable rtbl = new RenderTable(); doc.Body.Children.Add(rtbl); doc.Outlines.Add(new OutlineNode("Document root", rtbl)); // set up data binding for rtbl.RowGroups[0,1]... rtbl.RowGroups[0, 1].DataBinding.DataSource = myDataSource; rtbl.RowGroups[0, 1].DataBinding.OutlineText = "Customer: [Fields!CustomerName.Value]"; rtbl.RowGroups[0, 1].DataBinding.ParentOutline = doc.Outlines[0]; will add outlines to the data-bound rows of 'rtbl', and will make those outlines children of the 'Document root' outline node.