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Yes, it is doable in the desktop version of Word.
If the goal is to attach another file to the Word document as an appendix, use an embedded object:
- Open the Word document.
- Place the cursor in the Appendix section.
- Go to Insert > Object.
- Select Create from File.
- Select Browse and choose the file.
- Select Insert.
- Choose Display as icon if the file should appear as an attachment-style icon in the document.
- Select OK.
If the goal is to show the actual contents of the other document inside the appendix, inserting it as an object may not be the best choice, because embedded files are treated like objects and are not meant for full-page document layout.
For the issue where content is being cut off:
- Changing Orientation to Landscape changes the whole section unless the appendix is placed in its own section.
- If only the appendix pages need landscape, the appendix content must be in a separate section before changing orientation.
Also, if the file is being opened in Word for the web, some insert-file options are not supported there. The full desktop version of Word for Windows or macOS supports Insert > Object.
If the requirement is to include the appendix material so it is fully readable on the page, the practical options are:
- Embed the file as an icon in the appendix using Insert > Object > Create from File > Display as icon.
- If only part of the file is needed, copy and paste the needed text.
- If the appendix is a PDF, it can be inserted as an attachment object with Insert > Object > Create from File > Browse > OK. After insertion, it can be resized, but not edited in place.
- Embed or link to a file in Word | Microsoft Support
- Add a PDF to your Office file | Microsoft Support
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