Dear Emad
In KKO0 reports you can find many reports of this kind select the best for you. Remember you need to do data summarisation for this.
For individual order in KKS2 self you can you can have all required details for variances. Run KKS2 in test mode and press 'Cost element' button. The cost element wise detail will come. Now select the cost element for which you want to see the variance detail and press 'variance 'button. This will give you complete detail as how the variance is calculated by the system.
Regards
Rajneesh Saxena