When i'm trying to change payment file format record it will show alert for change file name....If I will change name then it will create another record. How to change data on existing file?

you dont, you make copies of existing formats

but i already worked on other account and on that account i don't need to copy of existing formats

there is a user event script deployed to the payment file format records to make sure you cant edit records with the native format field set to true

yes, i think netsuite did'nt give us permission to changed standard payment file. I tried to make copy of existing record and it will run.