How to export specific request to file using postman?

To do that you need to leverage the "Collections" feature of Postman. This link could help you: https://learning.getpostman.com/docs/postman/collections/creating_collections/

Here is the way to do it:

• Create a collection (within tab "Collections")
• Execute your request
• Add the request to a collection
• Share your collection as a file

1. Click on the "Code" button upright of the request page.
2. From the opened window select cURL.
3. Copy and share the generated code.

You can use this curl request to import it into Postman.

This discards variables, pre-request scripts, tests... or anything Postman-specific the request has.