Same stock items for all tally companies

Hi, We operate in different company names and sell the same goods(stocks) for various parties. So I wonder if it's possible in Tally to have common stock for all companies. Right now we have to enter the same total number of stocks in each company in Tally and deduct the number of goods sold while entrying sales voucher. But we are not getting total sales and closing stock because of that. Any help would be highly appreciable.