Hi Bhuvesh babu;
I understand from your post that you would like to know how to create a password for an excel sheet in MS office.
When you complete working on an excel sheet in File Menu go to save as function. you will get the save as dialogue box on which you will find tools option at the right hand side and you click on it you will get a drop down and you will find general options. You click on them then you will get password creation option you follow the instructions and give your password to open and also to modify.