On the NY tax return, Form IT-225 is used for reporting modifications to income and expense items - these are adjustments you'd need to make to your federal income for New York state tax purposes.
Schedule B, Part 2 specifically refers to subtractions that flow through to you from partnerships, S corporations, or estates and trusts. These modifications should be reported to you in the statements to your Schedule K-1.
For more information about what the different codes mean, see the NY Subtraction Modifications Chart.
