en/word2016/applying-and-modifying-styles/content/ Introduction Click for free trial of Office Tab! Recommended Word Productivity Tools. Here, Office Tab supports similar processing, which allow you to browse multiple Word documents or Excel workbooks in one Word window or Excel window, and easily switch between them by clicking their tabs. Follow these steps to merge two or more Word documents into one file: Open a new document. This comes in handy when you've got two or more people writing different parts of one document. Another useful feature of Microsoft Word is the ability to merge two documents into one.