How to update resource path and duplicate collection with one extra param

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In my Regression Tests collection which has 800+ tests, developer has changed resource path and we are going to support old resource path too for few months.
Also, they have added extra parameter supporting one extra functionality.

How can I create two extra set of collections i.e. one supporting new resource path and other having extra parameter?

I tried exporting entire collection json file and updating but it appears postman changes path to array and parameter to object. Updating/Replacing using editors like Word or Sublime doesn’t work.