New York Civil Practice Law & Rules R1011 - Successive third-party proceedings; counterclaims.

Rule   1011.  Successive  third-party  proceedings;  counterclaims.  A
  third-party defendant may proceed pursuant to section 1007  against  any
  person who is or may be liable to him for all or part of the third-party
  claim.  When  a  counterclaim  is  asserted  against a plaintiff, he may
  proceed pursuant to section 1007 as if he were a defendant.

Last modified: February 3, 2019