/sys$common/syshlp/helplib.hlb MERGE, Specification File Qualifiers, /FIELD, Example  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  /FIELD=(NAME=SALARY,POSITION:10,DIGITS:8,DECIMAL)

      This /FIELD qualifier identifies a field in a record by the
      name SALARY, specifies that it starts in position 10 of the
      record, is 8 digits long, and consists of decimal data.