If I buy goods in bill and sell without bill, then on paper, I need to show that I have sold in bill so I make fake bills and the buyer of bill will buy the bill from me and give me whatever profit and amount of Bill that is there on bill . So question was that such things I do to show on paper and to get the profit is allowed?

According to Sistani, doing something illegal is not permissible. So if this is considered illegal in your country, he says it’s not permissible for you to do that. But if it’s legal then that’s fine