Tell us what you are trying to do?
I have some product meta fields synced with Netsuite (stock, stock_status, channel_type, product_status,...) and I want these value to be duplicated (and synced as well) for my other languages (FR for now). This is not a one time sync (I would do it with a export/import if it was the case), this is a daily sync.
I have filters to display only some product for some customers. Since these meta data aren't available for FR products, there is no products visible in FR.
Is there any documentation that you are following?
No
Firstly, you need to make sure that the fields are set to copy. This means that when you change the content in the default language, it will also change in the translations. You can find more information on how to set this up and other options here:
+ https://wpml.org/documentation/getting-started-guide/translating-custom-fields/
Once this is set up correctly, updating the product should make the field available in other languages. However, this might not work when you import data. In that case, you'll need to update the post using WordPress. You may need to write some code to do this, ensuring that both the post and its translations are updated after an import.