Hi SK,
I am unable to find a KB referring the same via GUI. However, you can make same configuration using below steps:
1:set address trust server-pub 1.1.1.100/32
GUI--> Policy --> policy elements -->click on new --> configure the name(e.g. server-pub as per the CLI) and IP(e.g. 1.1.1.100/32), select the zone from the drop down (e.g. trust) and click OK.
2: set interface ethernet0/0 zone trust
GUI--> Network --> interfaces --> select the appreciate interface, click edit. It will open a new window, select the zone from the drop down here. Click on Apply and OK.
3: set route 1.1.1.100/32 int e0/0
GUI --> Networks --> Routing --> destination --> Select VR from drop down in the right corner. Most probably trust-vr. Now click on "new" to add a new route. It will open a new window.
Configure the IP/netmast --> Click on "gateway" instead of "virtual router" --> Select the interface from the drop down.--> OK
4: set policy from untrust to trust any server-pub any nat dst ip 192.168.1.100 permit
GUI--> Policy --Policies --> Select from and to zones from the drop downs (e.g. untrust & trust here) --> now click on new --> select source "any-IPV4" from address book --> select destination "server-pub" from drop down --> Service "ANY" --> select Action "permit" and click on "advance" in the bottom.
Check "Destination Translation " and configure actual service IP in "translate IP" (e.g. 192..168.1.100 here) --> Click OK.
Thanks,
Vikas