I have sent the request beneath to Behance Support, as I think they have totally disregarded archviz in their categories, - and I am quite sure that I am not the only one that miss a more precise category for our work. I'll suggest you to do the same - as multiple requests may convince Adobe that this is a real need.
"As a 3D archviz visualizer I am happy to add my work to Behance to get it out in the world. What I'm not so happy with is the categorizing of my projects under Creative Fields. Since is not in your list 3D archviz I have to mark it as architecture, illustration, digital art, ect - but none of them cover the essence of my work. I see that a large group of 3D archviz people have the same problem on Behance. Isn't it time to include some categories that cover 3D architectural visualization??? It would be a great help for me, my fellow 3D archviz people as well as people who try to lookup our work.
Thanks in advance"
