Check out org-map-entries. I have one example here:
https://scripter.co/looping-through-org-mode-headings/#example-modifying-a-property-in-all-headings
.

On Tue, Jul 19, 2022, 4:16 AM Uwe Brauer <oub@mat.ucm.es> wrote:

>
>
> Now, I would add to all subheadings a new property, say
>
>  :Received:  [ ]
>
> Whose value I will then individually change later.
>
> Any idea how to do that