How to file last 9 years return to clime refund

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RAVIKIRAN (Querist)
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02 March 2018 Hai to every one, ple help me my friend father was not filed his return till now from AY 2009-10 to AY 2017-18, now he want to file his income tax returns , the refundable amount is around 200000/- more , how to file his return to get this refund amount , is their any process to file the return for AY 2009-10 to 2015-16 with out any headaches , is he has the form 16 & VI A deduction bills to get this refund amount , and what sec he has to file his returns , ple kindly share the information as early , i hope anybody help in this issue .... for any information mail me mravikiran2010@gmail.com