N.H. Rev. Stat. Ann. § 547:33

The judges of the probate courts or a majority of them shall from time to time make rules for regulating the practice and for conducting the business in their courts in all cases not expressly provided for by law and shall prescribe forms, and, as soon as convenient after making or prescribing them, shall submit a copy of their rules, forms and course of proceedings to the supreme court, which may alter and amend them, and from time to time make such other rules and forms for regulating the proceedings in the probate court as it considers necessary in order to secure regularity and uniformity.