This thread is resolved. Here is a description of the problem and solution.
Problem: User was not able to tranlate a custom field for portfolios. Solution: the portfolio link is stored as a custom field "_dt_project_options_link", and is set to "copy" which will copy the value from primary language to translated portfolio. See attached images. Relevant Documentation: https://wpml.org/documentation/getting-started-guide/translating-custom-fields/
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