What exactly do you mean by "purchase info"? You only report sales on your tax return, not purchases. That's why the Form 1099-B from the broker, or the imported 1099-B information, only lists sales. The information from the broker for each sale should include the purchase date and basis of the stock or other investment that was sold. Is that what you are calling "purchase info"?
TurboTax can only import the information that the broker provides in the file that it sends to TurboTax for importing. Is the information on the 1099-B that you received? If not, it's usually because the broker doesn't have the information. In that case, you have to enter the purchase date and basis from your own records. But you enter the purchase date and basis with the other information about the sale. You do not enter purchases separately.
