@Arjz 

I think what you want is one-to-one NAT?

How to configure One-to-One NAT on Safestream routers using the new GUI

However it seems this function is only available in standalone mode. I'm using omada controller and I can't find this option.

  @Somnus 
Thanks for the input.

I have Public Ip with a different networks.
1st network has only 1 public IP.

2nd network has more 216.XX.XX.XX/26.

I also wanted to assign public IPs on the second network.

Is this still possible with the Omada router?

  @Arjz 

It depends on how many Modems you will connect.

If your public IP comes from 2nd Modem, and connected to 2nd WAN port, then yes the oamda router can do policy routing.

But if you only have one modem and only use one WAN port, then no I can't find anyway to do it on my omada router.