I hope I understand what you are asking. If you want to have taxes taken out of your part time job because you are afraid you will have enough earned income to actually have to pay tax on it then you claim Single or Married (whichever applies and the amount of dependents that you claim. Single 0 dependents will take out the most taxes from your paycheck. If you don't want them to take any money out (other than Social Security and Medicare) then you can write the word "exempt" in the area where you would put the number of dependents. Another option is to use 99 as your amount of dependents. Make sure you let your company know to do the same thing for your state taxes if applicable. Let me know if I mis-read your question.
