The article elaborates how to reuse a Data Source component across multiple reports.
You can create a custom component, inheriting a Telerik Reporting Data Source component, that is configured with the desired settings.
From the Project menu select Add -> New Item
In the Add New Item dialog box, choose a Component Class and click Add.
The new file is added to the project and automatically opened in Visual Studio.
Change the base class from Component to the appropriate Telerik Reporting Data Source component (Telerik.Reporting.SqlDataSource, Telerik.Reporting.ObjectDataSource, Telerik.Reporting.EntityDataSource, Telerik.Reporting.OpenAccessDataSource) as shown in the following code snippet:
Save and rebuild the project.
Right click the component class -> View Designer
Click Configure data source
Follow the wizard
Save and rebuild
The Project Data Source is now listed under the Project Data Sources node, if you run Project -> Add New Item -> Telerik Report [VERSION] Wizard. And the Prject Data Source is available in the Visual Studio Toolbox, if you open a report in the Visual Studio Report Designer.
The Standalone Report Designer can load data from external assemblies, which excludes custom data source components. For more details, check Extending Report Designer.
Instead, you can create templates with initial settings like configured data source components and layout elements - Report Templates.