The question that you are asking is not directly related to RadControls for WinForms functionality. Instead, it is a general development question and it is up to you how you will proceed with parsing the data using the data format that you plan to have. We can only assist you with code snippets regarding the process of adding nodes to RadTreeView and subnodes to the parent nodes (you can see more information about this here
), but before that you need to decide how the data from your data source will be parsed to objects in the appropriate hierarchical order.
the Telerik team