Exactly what kind of withholding are you talking about? Actual IRS taxes? It's uncommon to have withholding on dividends unless you are subject to backup tax withholding. You don't enter each stock etc. You only enter the total withholding listed on the 1099Div in box 4. Did you get a consolidated 1099 from the broker? You don't enter each dividend. You need to enter each section in the right place. So read it carefully and look for headings…1099-Int for interest or 1099-Div for Dividends and 1099B for sales.
