In the admin at the bottom underneath where you are adding the new HTML / WYSIWYG fields there should be an area called ‘location’ here you can set rules which decide where the new fields you have just created will appear.
You will need to select ‘Post Type’ – ‘is equal to’ – ‘NAME OF YOUR CUSTOM POST TYPE’
When your client edits one of the custom posts they will see the new WYSIWYG.
You can call it in the custom post template with
the_field('YOUR FIELD NAME')
Hope this helps
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