You don't. The supplemental information is for you to adjust your information. Your employer included additional income in your box 1 wages. That is added to the basis of the stock that was sold to cover the cost of the rest of the stock you now own.
The company may have reported it to the broker so an adjustment is not necessary. Usually, they don't. You need to check to W2 box 1 breakdown along with your 1099-B basis.
I am attaching an article about RSU for your reference. Click here: RSU reporting
Also, How do I enter Restricted Stock Units (RSU) sales in TurboTax Online? video(1:00)
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