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 the File Menu, go to the "Save As" function. You will get the Save As dialogue box, on which you will find the "Tools" option on the right-hand side. Click on it, and you will get a drop-down where you will find "General Options." Click on them, and you will get the password creation option. Follow the instructions and set your password to open and modify the sheet.
I hope this helps! Let me know if you need any further assistance.