Hello Jamshed,
I am not an expert either but what prevents you from doing a search yourself and making an effort to satisfy your requirement. I did a search on your requirement and found this. So, next time, try making an attempt yourself. You will also learn many other things.
Try this link if it helps
Step by Step Reference Guide to SAP (CIN) FI Excise Duty Procedures | SAP SIMPLE Docs
Mukthar Ali is an will be better equipped to guide you.