Each course in Arbor can have a Subject specified. Subjects are used in the Autumn Census for Secondary Schools and are also required by many of Arbor's integration partners. Please note that Arbor's list of subjects is taken from the DfE's Common Basic Data Set and as such, we're unable to make changes or add additional subjects.
The quickest way to set a subject for multiple courses is via the bulk action on the Courses & Classes page of your Arbor which can be found via School > Programmes > Courses > Table View.
Tick the checkboxes for all the courses that you need to set a particular subject (e.g. Art and Design) for, then click the blue pencil icon in the top-left of the list and select the 'Bulk update Subject' option.
In the slide over that appears, select your desired subject from the drop-down menu, then click the 'Bulk Update' button.
Once you've done this, you'll see the list of courses update to reflect the new subject values that you've assigned!