Best way to combine a few documents, in my opinion:
- Create a new document based either on the same template or on the first of the other documents.
- If you have text, go to the end of the new document.
- insert a Next-Page section break.
- Insert the next document, either by copy and paste or Insert > Object > Text from file
You will have the best results if all of the documents are (1) based on the same template and (2) use the same
styles for formatting.