\defineindentedtext[one][text=one]
\defineindentedtext[two][text=two]

\starttext

\one test test \par
\subone test test \par
\subtwo test test \par
\subsubone test test \par

\startone
    test test
    \startone
        test test
        \startone
            test test
        \stopone
        \starttwo
            test test
            \startone
                test test
            \stopone
        \stoptwo
    \stopone
\stopone

\stoptext
