You could add some logic into the tests and have some kind of “counter” value, so when it’s 1 (using postman.setNextRequest()), you could say to run requests 1 and 2, if the counter value is 2 then run 1 and 3 etc.
Removing the whole duplication thing in Postman seems to be one of the biggest challenges, in my opinion.
Check out the below post on keeping your tests DRY as there are some good answers from other experienced Postman users: