The Merge folder comparison window enables you to review and merge the changes within different versions of a text file by launching text, image or binary comparisons for each row of files that interests you.
To view the changes to a file, first select the file by clicking on it in the results list. Next, click the Launch comparisons 
button in the ribbon or toolbar. A file comparison window will open and you can review and reconcile the changes between
the versions of the file.
Launching multiple file comparisons
You can open file comparison windows for more than one file at a time by selecting multiple files in the folder comparison
results list before choosing the Launch comparisons button. Hold down Ctrl or Shift when clicking on files in the folder comparison windows to select multiple files.
You can also use the Select changed command from the Select rows 
menu in the ribbon or toolbar to select all the changed files before clicking on the Launch comparisons button.
Limiting the number of opened file comparisons
Each file comparison window that is opened uses a certain amount of system resources. There is a configurable limit on the number of file comparison windows that the folder comparison window will open to prevent these resources being exhausted. This limit can be adjusted using the controls in the Launch Behaviour page in the Options dialog.
A typical method of working is as follows:
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Choose the Select changed command from the Select rows menu to select all the files that have changed between the first and second folder hierarchies.
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Click Launch comparisons to open a file comparison window for each of the selected files. A file is deselected when a file comparison window is opened
for it.
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Review and/or edit the content of the file comparison windows that were opened. Close each file comparison window when you have finished with it.
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Return to the folder comparison window when you have closed all the file comparison windows.
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Click Launch comparisons again. If there are any remaining selected files in the list, another batch of file comparison windows will be opened.
Repeat the last three steps until there are no more selected files.
Updating the folder comparison after editing files
To update the folder comparison after making changes to a file, select the file and click on the Re-test selected 
button in the ribbon or toolbar to refresh the folder comparison results for that file after making changes.