How do I create new WPML xliff files that contain source text only?

Dear colleagues,

Does anyone who is familiar with WordPress know how to create xliff files with only source text out of xliff files that contain both source and target text?

Some of the WPML xliff files the client sent have translated segments on the target side and I am trying to clear them so that I can apply my custom xml filetype to these files.  I tried "saving source as" on these files, thinking this would make the newly created xliff files source text only files, but it didn't work.  Are there other methods I can try?

Thank you.

Chunyi