Question DMZ inside Plesk

[stussi]

Hi,

can I configure a DMZ directly into plesk (firewall+dns)?

Here is what I have:
1. an internal IP configuration with DMZ (192.168.*.*, 255.255.255.0, gateway and DNS) to configure on LAN1
2. an external public IP address 81.**.**.**.** to configure on LAN2

How I should configure the Plesk server to allow connection from the public IP using the internal DMZ?

I think I should set up the network internal IP configuration on LAN 1, than ADD two ip addresses in plesk, one for the internal lan and one for the external public IP.

After this everything should work? Or I have also to configure something in the plesk firewall configurations? Should I forward all incoming traffic from LAN2 (public ip) to LAN1 (internal IP) or viceversa?

Please help me Thanks!