Hi, Ihor

My config, not working yet, everything is numbered with org-num-mode:

(setq org-num-skip-unnumbered 't)

(setq org-use-property-inheritance '("UNNUMBERED"))

(setq org-global-properties '(("DIR" . "data/") ("UNNUMBERED" . "t")))

Maske

Maske <maske1foro@gmail.com> writes:

 From the first day, I liked org-num-mode, but I think that its default 
which numbers all headlines could be problematic.

Right now it only has the options to exclude headlines from being 
numbered, so it could be necessary to modify a big amount of headlines, 
for numbering just a tree.

I think it would be helpful to have a "positive" way to numbering 
headlines, for example "NUMBERED" keyword, while all the other headlines 
stay unnumbered.

You can simply set UNNUMBERED property to t for the whole document via
#+PROPERTY keyword or by customizing `org-global-properties'. Then, the
headings that should be numbered should have their UNNUMBERED set to nil.