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\starttext
\startchapter[title=Chapter 1]
\startsection[title=Section 1]
\startsubsection[title=Subsection 1]
\stopsubsection
\startsubsection[title=Subsection 2]
\stopsubsection
\startsubsection[title=Subsection 3]
\stopsubsection
\stopsection
\startsection[title=Section 2]
\startsubsection[title=Subsection 1]
\stopsubsection
\startsubsection[title=Subsection 2]
\stopsubsection
\startsubsection[title=Subsection 3]
\stopsubsection
\stopsection
\startsection[title=Section 3]
\startsubsection[title=Subsection 1]
\stopsubsection
\startsubsection[title=Subsection 2]
\stopsubsection
\startsubsection[title=Subsection 3]
\stopsubsection
\stopsection
\stopchapter
\stoptext