SV: Is it possible to distribute long headings on two lines in the text but on only one in the TOC?

[Ingar Pareliussen]

Hi

There are many ways to do this, but I suggest that you use chapter* and format 
the linebreaks (CTRL+ENTER) where you want them and then i ERT add just after 
chapter* add:
\addcontentsline{toc}{chapter}{This a long text with the name of the Chapter}

HTH
Ingar