Does anyone know how to do a " Doing Busines As " In Arizona?

I have two companies and I would like to start doing business with the other name. The one I am using currently is a sole proprietorship and I would like to start using my LLC Company. Can't I just file a "DBA" And start using the name I would like. I live in Arizona and I have gome to all the government, state, and county web sites and I have not found anything. Does anybody have any suggestions? Thanks!