If u r fr. maharashtra, go to the site www.mahavat.gov.in & download the form for vat & cst returns. It is in excel & fill the columns accordingly, press the validate button, which will display for any errors. If it is error free, a rem file will be created & after this, login to the site, choose submit return, browse & attach the rem file created by u & upload the same. Take printout of acknowledement & file it. Thats all.
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