Dear List!
I did this example, which works perfect. If i would like to take a new page after the Table of Content, is \page the right way?
% mode=mkiv
\setuppapersize[A7][A7]
\language[de]
%list the "subject" sections in the ToC but don't modify the "section" counter:
\setuphead[subject] [incrementnumber=list]
%"width": distance between number and text in the ToC entry, "margin" : indent of ToC entry relative to left page margin
\setuplist[section][width=1.5em]
\setuplist[subsection][width=2.5em, margin=1.5em]
\setuplist[subject]
\setuplist[subject, section, subsection]
\setupcombinedlist[content][list={subject,section,subsection}, alternative=c]
\starttext
\placecontent
\setupuserpagenumber[numberconversion=romannumerals]
\setcounter[userpage][5]
\page
\subject{Vorwort}
\page
\setupuserpagenumber[numberconversion=numbers]
\setcounter[userpage][12]
\section{One}
\subsection{Sec A}
\section{Two}
\subject{Bibliography}
\stoptext
Uschi