Parse Unblocked EBCIDIC File for different cobal copybooks

## Background [Optional]
I have a EBCDIC file which will have three types of records (information) based on first 4 or 6 bytes of the record we need to apply the different copybook(we have three cobol copybooks one is to read header records , 2 is to read some base records and 3 is to read some details records)

## Question

how can we parse the file using cobrix for different copy books on the same EBCDIC file. can someone help on this?