I’d use the “update” from my sql on the wp-postmeta to change the meta_value of the fields, to the new field key. Make a backup before 🙂
Update wp_postmeta set meta_value = 'new field key' where meta_value='old field key' and substr(meta_key,1,1) = '_'
Note that the meta value has to be in the form field_llnmc9c86353a
The second condition is just to check where are dealing with the right meta
Hi, adding a subfield to an already existing group is rather simple: you just add a property in the field declaration, telling which is the parent group :
'parent' => 'group_1'
See in details here : https://www.advancedcustomfields.com/resources/register-fields-via-php/ under “Individual”
