Hi @zilveer
Could you please tell me how do you want the client to show up? Do you want it as choices or just information?
If you want to show it as choices, you can always set the location rules. But if you want to show it as information, you can always use the acf/render_field hook to add it to a custom field meta boxes or use the add_meta_box() function to add it manually.
To show a relationship value, kindly check our guide here: https://www.advancedcustomfields.com/resources/relationship/.
Thanks 🙂
