You will enter the tax withheld as reported in lines 4 and/or 16 on your Form 1099-B when you enter that form as part of an investment sale entry in TurboTax.
You enter investment sales in the Wages and Income section of TurboTax, then Investments Sales, then Stocks, cryptocurrency, Mutual Funds, Bonds, etc... Upload your Form 1099-B or choose Stock, Bonds, Mutual Funds as the type of investment you want to enter. You'll come to a screen where you can enter in your sales proceeds, cost basis and taxes withheld.
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