Merge Documents. 1.) Click on the Review tab, then click Compare. 2.) Under Original document, click the name of the document into which you want to combine the changes from multiple sources. 3.) Under Revised document, browse for the document that contains the changes by one of the reviewers. 4.) Click More. 5.) Under Show changes, select the options for what you want to compare in the documents. By default, Microsoft Office Word shows changes to whole words. For example, if you change the word cat to cats, the entire word cats will show as changed in the ...