% book example for classicthesis.sty
\documentclass[12pt,a5paper,footinclude]{scrbook} % KOMA-Script book
\usepackage{lipsum}
\usepackage[linedheaders,parts]{../classicthesis}
%\hypersetup{linktocpage=true,bookmarksnumbered=true,pageanchor=true,hypertexnames=false,naturalnames=true,plainpages=false}

\begin{document}
    \tableofcontents

    % use \cleardoublepage here to avoid problems with pdfbookmark
    \cleardoublepage\myPart{Test Part}
    \myChapter{Test Chapter}
    \lipsum[1]
    
    \section{A Section}
    \lipsum[1]
    
    \myChapter{Test Chapter}
    \lipsum[1]
    
    \section{A Section}
    \lipsum[1]

    \appendix
    \cleardoublepage\myPart{Appendix}
    \myChapter{Appendix Chapter}
    \lipsum[1]
    
    \section{A Section}
    \lipsum[1]

\end{document}