Actual Cost Vs Planned Cost

Hi Experts,

I want write a report for the two things i.e actual vs planned.

i am currently trying to do planned cost vs actual cost

                                      planned time vs actual time

                                      vatiance and overhead

     in a singe report.

can anybody help me out to find tables to be used and how to fetch them

if anybody done this requirement earlier that code will be more useful.

Thanks & Regards

Sathish