I guess i`ve found a solution to my problem.
FIRSTARY VAR BYTE[7]
SECONDARY VAR BYTE[7]
THIRDARY VAR BYTE[7]
' DEFINE ARRAYS HERE...
ROW VAR BYTE
COLUMN VAR BYTE
DATA VAR BYTE
SELECT CASE ROW
CASE 1
DATA=FIRSTARY[COLUMN]
CASE 2
DATA=SECONDARY[COLUMN]
CASE 3
DATA=THIRDARY[COLUMN]
ENDSELECT

Thanks for your help guys...