If box 14 says U101 what do i choose for box 14 for the category that matches the total?

The "U" may stand for union dues, but you would have to look on your paystub to get a better clue as to what it stands for. It likely will not affect your tax calculation though, as the entries in box 14 are more for your information than critical to your tax return entries. You can ask you employer for clarification. 

Thanks Thomas