In wordpress, I use ACF Pro plugin to create custom fields. I created a field named promotional item, a type is a checkbox. In order for each product (woocommerce) to be different, I quickly choose different promotional code.
The problem here is. I want to edit the promotional code in dashboad, then automatically update on every product in use. If not currently updated, when you want to change the promotional code, you will have to go to each product to fix it. Very time consuming.
Who knows how to please only, I can share that plugins, but the host information and webmasters do not share it ah (for security reasons) so you sympathize for.