Filing of return for the previous years

SabuCS (soleproprietorship) (45 Points)

24 September 2017  
Sir. I have a client. Who filed its return of income for the year 2006-07 only. After that not filed. It's a tax audit case. Can I file return of income for all the years from 2007-08 now. Please advice. Income exempt u/S 80 p