I have specific census tags (and corresponding roles) in my primrary data set for the census records for 1790 - 1920. However, when I started a new project, the only available tag for census is "Census", no choice of differing years. When I look at the help index, it states I should "highlight the tag in the imported tag type window and then highlight the tag in the standard tag window and then hit "assign". Where exactly are these windows and where is the assign key?