wildchild1954, you can easily combine multiple DOCX files into one with Atlantis Word Processor, then
convert directly to EPUB:
1) Create a new blank document in Atlantis Word Processor (press Ctrl+N).
2) Choose the "Insert | File..." menu command of Atlantis.
3) Direct the "Open Document" window to a folder containing your files.
4) Select the files by Ctrl+clicking them.
5) Click the "Open" button.
6) Choose the "File | Save Special | Save as eBook..." menu command of Atlantis to save as ePub.