The purpose of this document is to record the procedures and studies that are established for setting the High Momentum Spectrometer (HMS) in the 12 GeV era. The NMR probe in the HMS magnet was moved and set to a new location since the 6 GeV era during the summer of 2017. Initial measurements were taken to precisely determine the central field values and the external NMR field measurements of the HMS dipole magnet with the corresponding current settings. The field setting programs and initial optimization of the HMS are discussed.