You can enable manual numbering


\setuphead[section][ownnumber=yes]

\starttext

\section{3}{Section 1}

\section{5}{Section 1}

\section{6}{Section 1}

\stoptext


or use a custom conversion


\defineconversion[drunk][3,5,6]

\setuphead[section][conversion=drunk]

\starttext

\dorecurse{3}{\expanded{\section{Section \recurselevel}}}

\stoptext


Wolfgang

> Fabrice Couvreur <mailto:fabrice1.couvreur@gmail.com>
> 12. September 2017 um 17:06
> Hello,
> The number of the sections is 1 2 3 ...
> How to make it 3 5 6 ... ?
> Thank you
> Fabrice
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