Yes, if you are claiming a Foreign Tax Credit, you will need that info from the supplemental form to enter in TurboTax regarding the amount of 1099-DIV income that is from foreign sources.
Your 1099-DIV reports the amount of Foreign Tax Paid in Box 7, which you enter in the 1099-DIV area in TurboTax.
Here's more info on How to Claim a Foreign Tax Credit.
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