separating physically merged files to avoid retranslation?

I am a novice using 2017. I physically merged files and translated it, only to find that I have to deliver the translation separately for each merged files.  I looked through the forums and there does not seem to be a way to unmerge them somehow... If anyone know how to do this, or know any other steps I can follow so that I do not have to translate again, can you please let me know? Strangely, though I tried creating a TM from the merged project and using it in individual-file projects, but, unexpectly, I did not see all matches. Please help. Thank you.

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