Woocommerce calculated price fields

I have a simple Auction by Woocommerce, I have a bid price, and i have taxes and commission. Of course the percentage of the bid is dynamic, I need the calculations fields to allow me doing: - enter taxes and commissions from the same product page. - and i need them to be calculated with the dynamic bid number and the result shows at the product page and at the checkout/cart payment page as well. I am using " Woocommerce Simple Auction " plugin.