Chapter 3 User Interface
3.3 Translation
You can add parts to organize one or more book chapters together. Parts can be inserted at the top of an .Rmd file, before the first-level chapter heading in that same file.
Add a numbered part: # (PART) Act one {-} (followed by # A chapter)
Add an unnumbered part: # (PART\*) Act one {-} (followed by # A chapter)
Add an appendix as a special kind of un-numbered part: # (APPENDIX) Other stuff {-} (followed by # A chapter). Chapters in an appendix are prepended with letters instead of numbers.