Sets or returns a boolean that represents whether or not Word will replace fonts based on size in this document.

public boolean SubBasedOnSize{ get; set; }
Public Property SubBasedOnSize() As Boolean

MS Word equivalent: Tools menu > Options... > Compatibility tab > Compatibility options for [filename].doc section > Options > Substitute fonts based on font size

          //--- Return SubBasedOnSize
          bool subBasedOnSize = cs.SubBasedOnSize;

          //--- Set SubBasedOnSize
          cs.SubBasedOnSize = true;
        
          '--- Return SubBasedOnSize
          Dim subBasedOnSize As Boolean = cs.SubBasedOnSize

          '--- Set SubBasedOnSize
          cs.SubBasedOnSize = True