[Resolved] Adding a New Language for Existing Product Categories

Problem:
The client needs to add German translations for over 1,000 existing product categories on their multilingual website, which are already translated into four languages. They attempted to import the German categories as translations of the Latvian terms using WP All Import, but the translations were not linked correctly.
Solution:
We recommend following the specific workflow outlined in our guide for importing multilingual content. Ensure that you use the WPML Export and Import add-on and adhere to the process described to correctly link the imported categories to the existing translations. You can find the guide here: Importing Multilingual Content.
If this method does not resolve the issue, another approach involves exporting all language data, ensuring the CSV file aligns with our documentation, and then re-importing each language. This should allow WPML to correctly connect the default language and its translations.
Alternatively, for manual assignment of a large number of categories, consider developing a custom code solution. Use our hook wpml_set_element_language_details to connect the German categories as translations of the default language.

If these solutions do not apply to your case, or if they seem outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Should you need further assistance, please do not hesitate to open a new support ticket at WPML Support Forum.