Actually I am new to this reporting tool, so I misunderstood that the variables are as the Formula (In Crystal Reports). Later I spent some more time, and got it and my reports are ready now.

Basically, it is a conversion project. The client wanted a replacement for Crystal reports and they have suggested us 3 tools (one of that is Stimulsoft) and gave us some of the toughest reports that they have in Crystal Reports. Initially I had few issues; I posted the questions, and was quite impatience for the replies. So I went through the entire Forum once and got the answers for all my questions. I have completed my task. My Vote on the 3 Tools is Stimulsoft Reports only.