Report customization

Hi,
I'm new to LN Programming....
I don't have more knowledge for reports in LN. I have created a standard report with all fields including a table. But I want to know how find the sum of particular field, how to create a new layout and how to use these layout in report script one by one. Hence can you please give me some ideas about the report customization process in a step by step manner... Also I want to create a report as like in the attached image.

Thanks a lot.
Pralash

Attached Images

report-1.PNG (23.1 KB)