Yes, all of the shares you received as RSUs are used to calculate the cost basis.
The RSUs do not belong to you until the vest. So your vested date is March 1, 2019 for both lots it does not matter if they were sold from lot A or Lot B.
Yes, the cost basis is the Fair Market Value on the date the RSUs vest.
When your shares vest your employer calculates an amount of compensation for those shares, and reports that in Box 1 of the W-2, so you're going to pay taxes on that compensation.
You need to report the sale of the shares and put in the cost basis so you are not taxed on the sale of the shares twice.
@shanku98
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