This thread is resolved. Here is a description of the problem and solution.
Problem:
The client wanted to know how to merge content from a separate multilingual site into their main site using WPML.
Solution:
We explained that WPML operates within a single site (database) and does not support merging multiple sites directly. To combine the content, the client needs to manually transfer the content from the secondary site to the main site where WPML is installed.
If this solution does not apply to your situation, or if it seems outdated, we encourage you to check the related known issues, verify the version of the permanent fix, and ensure that you have the latest versions of themes and plugins installed. If you still need assistance, please open a new support ticket.
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This topic is split from https://wpml.org/forums/topic/footer-translate-4/