Rule 4:29-1. Permissive Joinder
The court on its own motion may order the joinder of any person subject to service of process whose existence was disclosed by the notice required by R. 4:5-1(b)(2) or by any other means who may be liable to any party on the basis of the same transactional facts. The court shall not order such joinder unless it finds for specific reasons stated on the record that the interests of judicial economy and of non-parties which would be served by such joinder substantially outweigh the interests of the named parties in not joining additional parties.
Rule 4:29-2. Separate Trials
The court may make such orders as will prevent a party from being embarrassed, delayed or put to expense by the inclusion of another party where there are no claims made by either against the other, and may order separate trials or make other orders to prevent delay or prejudice.
N.J. Ct. R. 4:29