W-4 form updates

Hi. I have typically for the previous six years owed about $3000 Fed and got a State Refund of about $2000. Last year I got a pretty sizable bonus and I owed Fed $7000 and State $2000. I would like to avoid owing that much at tax time, but there is no simple way (like the good old days) to tell them to withhold an additional $200 / check or something similar...and the W-4 is way different than it used to be. Is there an easy solution to just withhold additional money, or do I have to start doing all the calculations...