The only way to achieve this, it to keep the two documents separate and format them, and then make a copy and unlink the fields, and then merge the copies. Go back to the original chapter files to make any changes and repeat the process.
The only way to achieve this, it to keep the two documents separate and format them, and then make a copy and unlink the fields, and then merge the copies. Go back to the original chapter files to make any changes and repeat the process.