Santosh,
I am not sure I understand your requirement. Since you are an expert in Sales and Distribution, why do you post a generic question about Sales and Distribution?
If you want generic help about SAP's ERP software, you should probably look at SAP's help docs in help.sap.com. Try Sales and Distribution (SD) - SAP Library for a start, study every topic you see on the left-hand pane. When you are finished with that, feel free to come back with more specific questions.
Best Regards & Good luck,
DB49