Use MACRO(yourmacro) option with any of the DB2I2 utility Command (REORG, COPY...) or DSCOPY
command to customize the generated JCL.
Example,
   COPY MACRO(my.macro(custcopy))

in my.macro(custcopy)

   C L10000 BACKUP All

will change
//LCP10001 DD DSN=prefix.yourDB.yourTS.L10000(+1), 

to
//LCP10001 DD DSN=prefix.yourDB.yourTS.BACKUP(+1),