Change to the GIF driver and generate the target output. DEV= changes the device driver to GIF so that the target output files will be generated as GIF files. FTEXT= and CTEXT= specify a font and color for the text in graphics output. PROC GSLIDE is then run four times to generate the four graphs that will serve as target output for the links that are defined in the drill-down graph. 
/* change to gif driver for target output */
goptions dev=gif ftext=centb ctext=green;

/* generate the target output */
proc gslide wframe=4
   cframe=green name='green';
   note height=20;
   note height=10
        justify=center
       'Green Grass';
run;

goptions ctext=blue;
proc gslide wframe=4
   cframe=blue name='blue';
   note height=20;
   note height=10
        justify=center
       'Blue Sky';
run;

goptions ctext=red;
proc gslide wframe=4
   cframe=red name='red';
   note height=20;
   note height=10
        justify=center
       'Red Wine';
run;

goptions ctext=gray;
proc gslide wframe=4
   cframe=gray name='gray';
   note height=20;
   note height=10
        justify=center
       'Gray Mare';
run;
quit;