In banking and financial modules every file will consists 
of Only one header records & Multiple Trailers (Transaction 
trailer & Batch trailer.

If it contains junk data we can do it by using Sed Editor 
or With help of PERAL SCRIPT.

1. If you know the signature of header and tailer record 
then use filerby expression component to filter the header 
and tailer records

2. Use one reformate component and then inside the 
transformation use next_in_sequence() function to assign 
unique numbers to each record,and then use filter by 
expression component to filter the records based on 
sequence numbers.

3.Follow the step 2 and use instead of filter by expression 
component use leading records component to filter the 
header and tailer records.