How do I export selected roof geometry as a DXF file?

The easiest way to “only import” certain parts of the AppliCad model is to export only those parts.
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As you will know, you can turn the visibility of certain items in the Roof Wizard model on and off using the Tools > Set-Display option.
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This is important, since when exporting a DXF file, you can set the software to only export visible items. See excerpt from the CAD Reference manual:
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Setting “Write All Entities” to [No] means that only visible entities will be exported.
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Here is an example roof that we modelled:

To Export just the Wall Lines to a DXF, I went to Tools > Set-Display and turned the roof off, but left the walls on:
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Then, we went to File > Export > DXF and set “Write All Entities” to [No].
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Select OK and you will be prompted for the file location to save the exported file to, and the file name.
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Here is the exported DXF file in AutoDesk’s® TrueView application:
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If the Tools > Set-Display option does not provide the level of granularity you need with regards to blanking or turning on and off certain elements, then you can use the CAD > Group > Blank option to perform blanking of individual elements, and individually select each entity to be blanked. Run File > Export > DXF again.