You will need to enter 0 unless you want to verify the amounts on each non-resident return you are claiming a credit from. Each state is different, so you would need to look at each nonresident tax return to find those numbers. Enter zero in those fields and see if your credit amount changes at all - it shouldn't. See page 2 for instructions on completing MS Form 80-160.
Form 80-160 cannot be e-filed; it has to be printed and mailed.

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