How to change length of field in reports in the DOS version of C5?

Hi - are there anybody who can tell me how I can change the length of a field in reports? I managed to go into the DOS version and change the length of the entry No in the daily journal. Now I need to change all other reports as well, just because we have changed the No on our Inoivces, so I need 10 characters on my reports - otherwise I will get a lot of small stars instead of a No.