Hello Rahul Khinvasara,
We will be able to help you design your reports, if you elaborate a little bit more on the exact goal that you are trying to achieve. Here are some things that should be known when designing SubReports:
1. The DetailSection of a report will be repeated as many times as there are data rows in the data source that the report is bound to. So if the Parent report has a data source, its DetailSection will be repeated and if the SubReport items are inside it -- they will be repeated as well.
2. If you want to use the Parent report simply as means of combining multiple reports, then you should leave it unbound. This way, its DetailSection will be repeated only once. The SubReports will appear only once too.
3. Each SubReport item will render its source report. It renders just like a normal report, with the only exception that it does not show page headers and footers, since it is being rendered in its parent's page context.
For a real life example of using SubReports, please take a closer look at the ProductLineSales sample that comes with Telerik Reporting.
You can also use this help topic
as a guide when creating SubReports.
I hope this information helps.
the Telerik team