HOW TO SHOW ONLY ONE FACEBOOK ACCOUNT TO POST PER SUBSITE?

I have multiple facebook page of my clients, and I want “this is the only account I want my colleagues/client to be able to post to” (or “These are the only accounts I want my colleagues to be able to choose from to post to”:wink:, and not show anything else.

I have read about the

define('WDFB_LIMIT_ACCOUNTS_ACCESS_TO', '123456789123','987654321987);

but it will limit all subsite to one or multiple choice of pages I’ve set in wp-config.

For example, I want to limit abc.com users to only post to facebook page wall of “123456789123”(abc facebook page)

and xyz.com users to only post to facebook page wall of “987654321987”(xyz facebook page)

Is there anyway that this functionality is subsite-activated not network-activated e.g. put it in functions.php of child theme or etc.

Thanks