Hello dgupta,
Welcome to the Monastery. This question was asked in the past on the Monastery Password Protect Excel File. I do not see any answer that can assist you on the relevant question but they propose a few other approaches.
Read it through maybe it will assist you. If you manage to resolve your problem update your question so other people can benefit from it too.
Hope this helps, BR.
In reply to Re: Make existing excel file password protected
by thanos1983
in thread Make existing excel file password protected
by dgupta
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