If I understood correctly you can do it using the RANGE clause of the command (1st element option), like:
dimension myarray(3,2)
myarray(1,1) = "a"
myarray(2,1) = "b"
myarray(3,1) = "c"
myarray(1,2) = "x"
myarray(2,2) = "y"
myarray(3,2) = "z"
@ 1,5 GET myvar ;
PICTURE "@&N" ;
FROM myarray ;
RANGE 2 ;
SIZE 4,10 ;
DEFAULT 1 ;
COLOR SCHEME 2
Read the help file for more details.