load balancing fqdn in post install wizard

Hi,

Hope you are doing fine.
I am using APM in load balancing environment, for example load balancing fqdn is " apm.isb.pk." fqdn for gateway 1 is "apmgw1.isb.pk" and fqdn for gateway 2 is "apmgw2.isb.pk". whenever i enter load balancing fqdn in gateway 1 post install wizard automatically it replaces it with gateway 1 fqdn similarly with gateway 2. how can i replace gateways fqdn with load balancing fqdn in post install wizard? kindly help.

Best Regards