please sir's can any one help me urgent

production was started in the month of feb,2010, but he is maintaining stock records from 1-04-2010. He is not having 100% purchases or sales bills,but having vat return for the momth of march,2010. My query is 1.how much of stock he has to show on 1-04-2010 and how can we find out that? 2. Is it mandatory to maintain stock register manually if he qmaintains stock details in tally for weekly ?. Thanks for ur's valuable reply in advance.