you have to find the sell with a loss from broker A and the triggering transaction from broker B and adjust them and replace those transaction's details as imported by TurboTax.
This changes the subtotals on the Form 8949 and the subtotals on Schedule D (all recalculated for you by the program) but in the end the gain/loss should show no change else you made an error.
then repeat for any other wash sales due to multiple brokers.
Are you sure you want to go through with this?
your next question is going to be "how do I adjust for a disallowed loss?"
@PJhiker
