My 1099-B has a section "Federal / State Taxes Withheld", but I don't see this section option in TurboTax. No other boxes filled for that sections. How do I enter this?

Tax withheld is not included in the other section I have for the "Covered Short-Term Gains or Losses on Gross Proceeds" because there is not one to one relation (one tx withheld is related to more than one sale).