Start from Deductions & Credits --> Foreign Taxes. TT walks you through entering the foreign source income only if you click off "You have no more foreign taxes to enter other than those you already entered in 1099-DIV, 1099-INT, 1099-OID, or a Schedule K-1."
Apparently the source income that should be entered is the total foreign income, *not* the QID eligible foreign income.
There is no standard location for where to find this information.
I received a separate statement from Vanguard with this information. For Dodge & Cox International, I had to multiply 1099-DIV box 1a by the foreign source income percentage amount, found in a separate form. For Merrill Lynch, it was buried in my 11-page tax reporting statement under an itemized list of dividends.
