Yes, that's right. If the disallowed loss from the wash sale was added back to your subsequent purchase of the stock, then you can enter your cost basis as it appears on your 1099-B, and then make the adjustment to cost basis to account for the fact that the disallowed loss was added back to your cost basis.
Keep your 1099-B and the Supplement because both documents support your entries on your tax return.
@kamal444
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