Hello,
one more question.
When I place \part into \...bodymatter and \...appendices, the \part
in body matter yields "Díl " + number, which is OK, but in appendices
it gives "<nothing>" + Roman number ("I", "II", ...).
You have to change the default conversion for the appendix.
What is
the most systemic to \setuphead[part] to give "Díl..." in body matter
and "Dodatek..." in appendices, and also to get letter numbering ("A",
"B"...) in appendices (so "Dodatek A", "Doadatek B", ...)?
You have to set a label for the appendix with the appendixlabel key.