457 NYSDC is currently unavailable in QuickBooks Online (QBO) Payroll, Huntb8017.
In the meantime, you can track your retirement plan contributions outside of QBO. I suggest consulting an accountant to ensure that these contributions are handled correctly and properly recorded. This will help you manage the 457 NYSDC plan contributions accurately in your financial records.
If you don't have an accountant yet, consider utilizing the QuickBooks Certified ProAdvisor website to assist you in finding a qualified professional.