Thanks Mr. Chankhour! I have got your answer from the other reply. After I read the getting started guide again and try many ways to change the price list and options for the product, it seems worked!
Just wonder if in the future will there be a new function to alter SKU as well. For example, each product options obtain unique codes, then when customers choose different colors, size... at the end SKU will generated by collecting order code by the order of options. (Please take a look at the attachment for better understanding). Thanks.