I have a single select, drop down lookup field that I would like to manually add a "Select All" option too. The lookup values are from another form/report and will change, but I would like "Select All" to be always added and at the top of the list.
This isn't a request to actually select all of the values, but just to record that it is the choice so I can use it in functions elsewhere

this is an example of what I want to accomplish

Thank you