When working with different word documents, you can merge two or more of them as one. Different from adding these files as attachments, merging files together is to merge the text together and make it as one file with full content.
The common way to merge word files together is to copy the second one and paste to the end of the first document. This is perfect when the files are short. When you have to copy a very long document, this method becomes problematic. Please see the steps below for details:
Step 1: Move the cursor to the end of the file;
Step 2: Click the "Insert" tab from the ribbon;
Step 3: Click "Object" in the "Text" section, then click "Text from File" from the drop-down;
Step 4: Browse to the location where the file is located, and click "Insert" to merge the files.
If you have a PDF file made from the word file, you can merge together with the same steps.