The toolbar buttons in the compare editor allows you to merge changes from the left file to the
right file and vice versa. There are four types of merges you can perform:
Copy All from Left to Right
Copy All from Right to Left
Copy Current Change from Left to Right
Copy Current Change from Right to Left
The Copy All from Left to Right and Copy All from Right to Left
actions completely replace the contents of one resource with the other resource.
To merge a single change:
Select the highlighted difference that you want to merge.
Depending on what you want to do, click either the Copy Current Change
from Right to Left or the Copy Current Change from Left to Right
toolbar button. The selected text is copied from one file to the other.
Right click to get the resource's pop-up menu, and select Save.
The image below gives an example of two files (file1.txt and file2.txt) compared.