I know nothing about WF, so all i can do is offer a suggestion that may not work
import the 1099-Bs one account at a time
If WF uses a master account number for all 4 accounts this likely will not work since the import contains the a/c number and the imported data is buried somewhere in the Turbotax file that is inaccessible.
FYI when you import the Turbotax form has an account number
you'll ned to remove previous 1099-B import to avoid doubling up.
