How to Create SubReport in MainReport for SAP Crystol Report using ASP.net MVC

Hello
             I am new to MVC ,i need to generate more than reports  into single Report. for example
Totally i have 3 expenses Report like on below:
1.Fuel Report
2.Tollgate Report
3.maintenance Report

But now  my requirement as like in these 3 Reports combined together  for a single report "Employee Expenses Report".
So Can Any one Suggest for Solution this issue