2nd choice.
if you have two accounts with Charles Schwab it's like having one account with A and one account with B. each must be separately imported.
send the 2nd 1099-B. sort of surprised that the IRS didn't get the cost basis off it - but perhaps it was in the section cost basis not reported to IRS. include a signed letter stating that your including the 1099-B for the sale of X and that you are claiming cost basis of Y as shown (it was shown wasn't it) on form. therefore the gain isn't $54k as shown on notice but $xx. if there is no cost basis on 1099-B also send whatever proof you have as to cost basis.
