Both Endevor and Changeman can be on the same system. Neither product controls the programs that run the system; this is done by an IBM program called SMP/E.
Your site management defines the procedures to run both Changeman and Endevor. I doubt that you could get a valid answer from this board.
Your second question is more complex. The usual meaning of "increase the size of file" is that you want to add more data at the end of the file. However, you add that you want to increase the size of individual records in the file. This is more complex. What you have to do is -
- Make 100% certain that your management approves this change, and how you propose to implement the change.
- Locate every program that uses file 2.
- Update every program to use the new data definition.
- Write a program to translate file 2 to the new format.
- Build replacement file 2 data for every real occurance of the file.