I understand that NTA supports Netflow v9 without any configuration. I may need correction here as we're not using v9.
All you should need to do is make sure that the device you're configuring is exporting using the correct netflow version, e.g. for Cisco:
ip flow-export source <interface>
ip flow-export version 9
ip flow-export destination <ntaipaddress> <portnumber>
plus any other template options
NTA should then recognise the netflow version accordingly. Obviously said device needs to be monitored in NPM and added as a netflow source.