In the \startbackmatter ... \stopbackmatter section i would like to have some chapters that are not automatically placed on a new page for the next chapter. Is there an easy way to suppress the new page for these chapters?

Thanks, Jeroen

Untried:

1. Define a new section head that clones chapter (\definehead[NPChapter][chapter]).
2. Modify the new section head so that it does not do a break (\setuphead[NPChapter][page=no]).
3. Use the new section head instead of \chapter or \startchapter.