title: Adding a field to an existing COBOL data file
body: <p>I have an existing MF COBOL 4.0 program with years of data in a ISAM file but I need to add a new field to the existing file. The record currently has 1208 chars and I need to add another 10 to it.</p>
  
  <p>If I simply put the extra PIC X(10) field in my copybook, it gives me an error.</p>