Multiple Instances related query in TPAM

We have added multiple domain instances in our TPAM in admin interface -> system status settings -> External authentication->WinAD config-

Instance names are vmware.com and vmwtest.com

we added vmwtest.com system entry in active directory platform section

we would like add vmware.com systems with vmware.com domain functional account and vmwtest systems with vmwtest domain functional account.

In connection Tab -> Use domain account section -> we should be able to see both domains functional accounts.

Please advise how can we complete this configuration.

Appreciate your support on this.

Thank you

chiru