Answer / prasad perla

1st we need to be clear where the need come into picture for adding a field.
Suppose 
1-Q) If needs add a field any where in the record structure is fine , then.
1-A)We can add a field in copy book by adjusting the filler at the end the record layout for the detailed/Header/Trailer record.
2-Q) If suppose a field is in the middle of layout and a requirement came like to add a sub-field under the group field which is in the middle of layout.
 Then we can add but the layout field positions will get changed due to inserting a field in middle of structure. so here impact is more and changes as well more.
3-Q) After adding a field either as per the option 1 or option 2 , needs to be look in all programs where do we have used the copy book and those all programs needs to be changed accordingly and re-complied with new copy book to get the new load.

might be i have wrote bit more for your understanding... thought it would be helpful.

Answer / ajinkya bijagare

If Copybook changes(Table changes)are done like insertion of new field.
1) Re-compile the copybook after changes are done.
2) Find all the COBOL program and subprograms which is having SELECT, INSERT,DELETE, UPDATE DB2 statements.
3) Check if needed to insert newly added field name in the query. If yes do so and Re-compile all changed programs and subprograms.
4) In this way new Cobol program load module will get created with new copybook.

Answer / dinesh rathod

You need to modify the underlying data file to match your file definition in COBOL. One way to do so would be to define a line of output exactly like what lines of your data look like now, but with an extra Pic x(10) on the end of it. You would then read in your data line by line, and output it to a new location 

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