You can specify many file attributes as an extended class attribute on the LPR command with the -C control file line. Insure you separate each value with a colon (:) Examples:
LPR -Susilca31 -PXUNIX -Ca:pagedef=a06462 testfile.txt
LPR -Susilca31 -PXUNIX -Ca:pagedef=a06462:formdef=a10110 testfile.txt