@failcookie I have been looking for a solution to a similar problem and was wondering if you could share your code with the addition of the dropdown. Thank you.
@paulhuisman I am trying to solve this problem myself. Would be great if you posted your solution.
@awc No, I have not got this working yet. Thank you for offering the code if you come across it.
Thanks John for the help. I also appreciate your support on these forums. I am new to ACF and your code and comments have been very helpful with my project.
@awc Did you ever get this working. I am not sure if what I am trying to accomplish is similar to what you are trying to do in your project.
I have an Option Page with a text area that lists all of our contractors. I would like our users to be able to add a contractor in the select field that is not listed so they do not have to go back and forth between the CPT edit page and Option Page.
I am looking to do something similar to what you are trying to accomplish. I ended up stumbling upon this link to an example from a post in the forums. I hope this help.
https://github.com/Hube2/acf-dynamic-ajax-select-example/tree/master/dynamic-select-example