\setupinteraction
  [state=start]

\placebookmarks
  [part,chapter,section,title,subject]
  [force=yes]

\setupcombinedlist
  [content]
  [list={part,chapter,section,subsection},
   alternative=c]

\setuphead
  [part]
  [placehead=yes,
   bodypartlabel=part]

\starttext

    \startfrontmatter[bookmark=A fancy title]
        \startchapter[title={The introduction}]
        \stopchapter
        \startchapter[title=Contents]
            \placecontent[criterium=all]
        \stopchapter
    \stopfrontmatter

    \startbodymatter
        \startpart[title={part}]
            \startchapter[title={Some chapter}]
            \stopchapter
        \stoppart
    \stopbodymatter

\stoptext

