Hi , i am working on multiple stores with same products ( same SKU but different POS ID's) And i have select clonable field, which i need to be assigned to product ( in woocomerce product exporter) that i could reimport it and map by SKU , now it saves to CPT , but its not shown in exporter. (i was trying to make it select multiple also, then the metabox would appear in the csv exported, but only last select option would be displayed).
The cloneable field select_advanced with the setting 'multiple' => true saves the serialized array (array of array) value in the database. It's very complicated to export and import the product info by WooCommerce Exporter or another import/export plugin.
You can try to export all products via WordPress Export in an XML file by going to Admin Dashboard > Tools > Export > Choose Products. Then import the XML file on other sites.