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This thread is resolved. Here is a description of the problem and solution.
Problem: I am developing multilanguage site, and I have to get know the WPML. For example: Importing translations of thousands of custom post types. In this case I make copy of each post, assign them the same trid in icl_translation table, and finally update the post_title and post_content in database to the foreign language.
Solution: Use WP All Import plugin to make this easier. You can have a look at this article https://wpml.org/documentation/related-projects/wpml-all-import-plugin-website-import-with-wpml/.