I was looking for this answer too. Thankfully, I was able to find it by digging around in the input. On the "20yy Estimated Payments" input sheet under "Payments, Penalties & Extensions", scroll down to "Paid with Extension (not later than 4/15/yy) and enter the amount in the state column for the "amount paid". Then the GA IT-560 populates and can be printed.
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