Converting numbers to letters

I have a chart with the alpabet in the first column in the next four columns are numbers that correspond to the letters in the 1st column. How can I use MS Word to reference my chart and convert these numbers to letter and vise versa. Also since I have 4 seperate columns of numbers. I need to be able to specify which column of numbers I want to be used to deciper my alphbet. Does anyone have any ideas on the best way to do this? Basically it is making 4 seperate decoder wheels/rings but just automated so it will decipher what is typed in Word (alpha or numeric). Thanks for you help.