The feature is not supported in Telerik Reporting as the main goal is data presentation which includes exporting it to various formats. Merging already created PDF files or byte streams can be performed with another software (you can check the forum for other members post about their choice). If you need to unite several reports on export, we can suggest you to use the ReportBook
document where you can add different report definitions and export them at once in a single PDF document without additional file merges.
Let us know if you have nay further questions.
the Telerik team
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