In general, Telerik Reporting is a general purpose reporting engine, which primary goal is to analyze data and represent it in a human-readable format that is also suitable for printing. It has no specific features in terms of Avery labels support.
Thus, in order to reuse sheets you may need to redesign your report accordingly.
New HTML5/JS REPORT VIEWER with MOBILE AND TOUCH SUPPORT available in Telerik Reporting Q3 2013! Get the new Reporting version from your account or download a trial.