Hello Zbigniew Kozłowski,
Do you follow our best practices
to first create a class library that contains your reports and then reference that class library in applications that view the reports? This way you can have any number of Windows or Web viewing applications that get re-use out of the same class library.
Check out the following help article Creating a Simple Report
for detailed explanation of how to create a report.
All the best,
the Telerik team
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