Hi,
We are glad to share that the Table of Contents feature is included in the R3 2016 release of Telerik Reporting.
You can download the product from your Telerik account and check the release notes (http://www.telerik.com/support/whats-new/reporting/release-history) and online help (http://docs.telerik.com/reporting/table-of-contents).
A sample report demonstrating the feature is available in our online demos: http://demos.telerik.com/reporting/product-catalog