% taken from the list ... enable sectionblocks to see the difference

\setupinteraction
  [state=start]

% \setupbookmarks
%   [sectionblock=yes]

\placebookmarks
  [part,chapter,section]

\starttext

\placecontent

\startfrontmatter
    \startchapter[title=Prologue]
        \input knuth
    \stopchapter
\stopfrontmatter

\startbodymatter
    \startpart[title={Part A}]
        \startchapter[title=One]
            \input knuth
        \stopchapter
        \startchapter[title=Two]
            \input knuth
        \stopchapter
    \stoppart
\stopbodymatter

\startbackmatter
    \startchapter[title=Epilogue]
        \input knuth
    \stopchapter
\stopbackmatter

\stoptext
