RadHtmlChart does not have a feature to show grouped chart directly, but you can follow the approach shown in the following live demo in order to rebind the chart with more specific data when a series is clicked:
Another option I can suggest you is to consider utilizing the Data Navigation feature of the control:
Get quickly onboarded and successful
with your Telerik and/or Kendo UI products with the Virtual Classroom free technical training, available to all active customers. Learn More.