Modifying exec parameters

//MYJOB JOB 1,NOTIFY=KC03H09
//MYPROC PROC
//STEP1 EXEC PGM=IEFBR14,TIME=10
//DD1 DD DSN=KC03H09.Y110.Y0,
// DISP=(NEW,CATLG),
// SPACE=(TRK,(5,2,1))
//SYSPRINT DD SYSOUT=*
// PEND
//STEP2 EXEC PROC=MYPROC,TIME.STEP1=20
//SYSIN DD DUMMY