How to add an existed custom field to another new field group.
Solution:
You can edit the field group, click "Add New Field" button-> Choose from previously created fields, see my screenshot, find and select the exist field "ID (In)", and test again
Problem:
The user does not get the price and add-to-cart in the WooCommerce products.
Solution:
It turns out that the user was assigning a layout to products, and the layout was empty.
After adding the price shortcode and the add-to-cart shortcode they appeared.
