Enable optional interface on SonicWall 3060

Device: Sonicwall PRO 3060 Standard
OS: SonicOS Standard
I have three unused optional interfaces (x3-x5) and I'd like to configure one. WAN, LAN and a DMZ (on x2) are already configured. I'd like to configure another DMZ on x3, but I can't find how to create or configure it in the web interface. Documentation seems worthless. Thanks.
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I am almost certain that the spare ports are all switched LAN ports.  You will need to upgrade to enhanced OS to get the granularity you need.

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jroberts389Author Commented:
I believe you are correct. Thanks.
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