I recommend entering each transaction separately just as it shows on your 1099-B.
No need to enter "sold for taxes" anywhere in TurboTax. When Federal income tax is paid with your RSUs, that amount will be accounted for and reported on your W-2 in box 2 Federal Income Withheld.
Here's a 1-minute video that gives you a little more info and gives you steps to get back to that section in TurboTax.
