Modify the subgroup legend. LABEL= suppresses the legend label. SHAPE= defines the shape of the legend values. POSITION=, OFFSET=, and ACROSS= arrange the legend entries in a column to the left of the pie chart. MODE= allows the legend to occupy the procedure output area. 
legend1 label=none
        shape=bar(4,4)
        position=(middle left)
        offset=(5,)
        across=1
        mode=share;