Member Properties for a 2.5"x2.5" 14 Gauge Double Tube Cold Rolled Steel member in STAAD

I'm needing to assign member properties for a double tube 2.5"x2.5"-14 gauge in my model. When I enter the properties into the program via the "user table" tab it shows the member as a single tube (pdf attached). Is there a way to define the member as two distinct single tube members formed together to make a double tube? I have also tried using the section wizard but it keeps giving me an error.

Any help is greatly appreciated

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