You are looking for some example JCL to perform a LIBR multifile backup
// JOB XXXLIBR Multifile BACKUP // MTC REW,181 // TLBL SARTAPE,'SARBACK.001,H' // EXEC LIBR BACKUP L=SARLIB TAPE=SYS010 TAPEL=SARTAPE RESTORE=ONLINE /* // TLBL SARTAPE,'SARBACK.002,H' // EXEC LIBR BACKUP L=SARXLIB TAPE=SYS010 TAPEL=SARTAPE RESTORE=ONLINE /* // MTC REW,SYS010 /&