If you send a document for review by multiple reviewers, and each reviewer returns a document, you can combine the documents one at a time by merging the two documents until all reviewer revisions are merged into a single document.
On the Review tab, in the Compare group, click Compare.
Click Combine revisions from multiple authors into one document.
Under Original document, click the name of the document from which you want to combine revisions from multiple sources.
If you don't see the document in the list, click Browse for original content
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Under revised documents, browse to the document that contains the revisions that were made by one of the reviewers.
Click More.
Under Show tracked changes, select the options that you want to compare in the document.
By default, Microsoft Office Word displays changes to the entire word. For example, if you change the word cat to cats, the entire word cats will appear as changed in the document, not just the character S.
Under Show changes where you are, click Original document.
Click OK.
To change the document that appears on the screen when you click OK, in the Compare group, click Hide Source document or show source document.
Repeat step 1-8. Word merges all revisions into the original document.
Note Word can store only one set of formatting changes at a time. Therefore, when merging multiple documents, the user is prompted to decide whether to keep the original document in the format or to use the edited document. If you do not need to track formatting changes, you can clear the Format check box in the Compare and Merge Documents dialog box.