How to set variable to execute specific data from csv file

My question:
I have a multi testcase in csv, in such a condition I just want to execute case 1 and 3 to do stress test.
I know how to set variables in Postman to get data.
but now I am facing I don’t want to test all case.
I am thinking it is fine to use var to detect the row of the specific case, but I don’t know what is the iteration pointer through data?
I found " postman.setNextRequest(“”);" but it is depend on request.