Here a requirement which requires combining more than one file into a single file.
File 1: (Unique Acct. Numbers) - rec length : 80
File 2: (Acct number will be repeated, sorted by act num) FB, Recl : 500
File 3: (Acct number will be repeated, Sorted by act num) FB, Recl : 500
Acct1 Update T1
Acct1 Update T2
Acct1 Update T3
like that we have 2 more files all are FB, Recl : 500.
Acct1 File2_Info File3_Info File4_Info File5_Info