1. So Vanguard paid foreign taxes. TurboTax imports this correctly from the Vanguard tax form.
2. TurboTax now: "Now enter the portion of the $xxx dividends and distributions that was from a foreign country or U.S. possession."
3. Vanguard provides in a supplemental form the percentage for each mutual fund that's foreign. However, it doesn't provide me with a breakdown of what percentage of the dividend comes from each mutual fund.
I thought the point of TurboTax was that it does the taxes for me, not give me unsolvable riddles.