How to get back on a higher section level?

How to get back on a higher section level?

This is a follow up to here.
Just out of typographical interest: Is it possible to get back to a higher
section level in some document? Kind of misusing a subsection as a bigger
bracketed part of a chapter. Sorry, difficult to explain (and I guess,
that's the reason I coudn't find anything on google or here...).
In a sentence, you can write "bla (blup [bla bla {blup}] bla) blup bla
(blup) a.s.o..." and everybody would be able to follow. Is that also able
for sectioning. And is it "allowed", typographically well seen...?
And if you use such behaviour: How do you do it? Ornaments or white spaces
like in the link above? Would the reader really get, what is meant? What
about jumping two levels (sorry, I am getting abstract, but I find it
interesting)?



And to ask something technological, too. How would the header on following
pages know, that I am back on a higher level again?