org-use-property-inheritance

org-use-property-inheritance is a variable defined in `org.el'.
Its value is

nil

Documentation:
Non-nil means properties apply also for sublevels.

This setting is chiefly used during property searches. Turning it on can
cause significant overhead when doing a search, which is why it is not
on by default.

When nil, only the properties directly given in the current entry count.
When t, every property is inherited. The value may also be a list of
properties that should have inheritance, or a regular expression matching
properties that should be inherited.

However, note that some special properties use inheritance under special
circumstances (not in searches). Examples are CATEGORY, ARCHIVE, COLUMNS,
and the properties ending in "_ALL" when they are used as descriptor
for valid values of a property.

Note for programmers:
When querying an entry with `org-entry-get', you can control if inheritance
should be used. By default, `org-entry-get' looks only at the local
properties. You can request inheritance by setting the inherit argument
to t (to force inheritance) or to `selective' (to respect the setting
in this variable).

You can customize this variable.