Add extra info to your header from COMMENT/ INPUT statements.
For this to work you must have your header already setup to accept TRACEFIELDS
C1 =COMMENT/INPUT,NO,Piece #
C2 =COMMENT/INPUT,NO,Cavity #
ASSIGN/V1 = C1.INPUT
ASSIGN/V2 = " "
ASSIGN/V3 = " Cavity #:"
ASSIGN/V4 = C2.INPUT
TRACEFIELD/NO_DISPLAY,LIMIT=15 ; Piece # : V1+V2+V3+V4
COMMENT/REPT,