I'm trying to set up a buffer-wide property value for my project files.
Currently I have a level-1 header like this:

* project
:PROPERTIES:
:project_name: this_projects_name
:END:

I know this can be inherited by sub project, but I have many more level-1 headers
* level1 header
** sub header

I can't seem to find a way to set up the property :project_name: to be a file-level or buffer-level property that is inherited and visible in custom agendas.
I've tried several variants including a level-0 property drawer and using #+PROPERTY :project_name project_name


(setq org-columns-default-format "%10CATEGORY %30ITEM %TODO %PRIORITY %20project_name %LastWorked(Last Worked On) %LastWorked(Hours Ago){@min} %FILE")

Custom agenda command:
("Z" "Last Worked skip" ((alltodo "" ((org-agenda-skip-function (lambda nil (org-agenda-skip-entry-if (quote notregexp) "\\:LastWorked\\:")))
(org-agenda-sticky nil)
(org-agenda-view-columns-initially t)  <<<this also seems to not be working
(org-agenda-sorting-strategy (quote (tsia-down todo-state-down)))))))

The Skip function works great, but unfortunately the agenda also does not pick up any headers without a  TODO state even if they match the LastWorked regexp.
If anybody can provide some insight on either of these problems I would be much obliged!



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