"I had some RSUs vest and my company sold a portion of the lot to cover taxes."
The more correct way of stating that is "my company sold a portion of the lot for me to cover my portion of taxes." The second the RSUs vested you owned all the stock in the grant. Nobody but you could sell those stocks. If you'd wanted to you could have reached into your pocket and handed the cash "for taxes" to the company and ended up with all the stock in the grant instead of just a portion of the grant. You got a 1099-B for your sale so you need to report your sale.
When you report your sale be sure to use the correct basis, which is not the $0 reported by the broker on the 1099-B. Your per share basis is the same as the per share "fair market value" used by your employer to calculate the compensation created by the vesting.
Compensation = (GROSS number of share in grant) x (per share "fair market value" selected by the employer)
There's no real "Income Tax Return Reporting" need to use the RSU guided interview.
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