New York Codes, Rules and Regulations
Title 22 - JUDICIARY
Subtitle A - JUDICIAL ADMINISTRATION
Chapter II - UNIFORM RULES FOR THE NEW YORK STATE TRIAL COURTS
Part 202 - Uniform Civil Rules for the Supreme Court and the County Court
Section 202.31 - Identification of trial counsel

Unless the court otherwise provides, where the attorney of record for any party arranges for another attorney to conduct the trial, the trial counsel must be identified in writing to the court and all parties no later than 15 days after the pretrial conference or, if there is no pretrial conference, at least 10 days before trial. The notice must be signed by both the attorney of record and the trial counsel.