When you need to combine multiple documents, but don't want to go through the hassle of manually merging them and consolidating the formatting, why not create a single master document? The master document function handles page numbers, the index, and the table of contents.
How to Use a Master Document in Microsoft Word
A master file shows the links for individual Word files. The content of these subdocuments is not in the master document, only the links to them. This means that editing the subdocuments is easy, because you can do this on an individual basis without disturbing the other documents. In addition, edits made in individual documents are automatically updated in the master document. Even if more than one person is working on the document, you can send different parts of it to different people via the master document.
To create a new master document, follow this procedure:
Create a new document and save it, even if it is still empty.