It's not clear to me what you want to do. What does "leaving one particular field" and "leaving any one the field" mean exactly? Are you trying to find a particular value, like aaa, in the file and just copy the record with that value to the output file? If so, you can do that with the following DFSORT job. I've assumed your input file has RECFM=FB and LRECL=80, but the job can be changed appropriately for other attributes.