If you are trying to create a graph depicting the number of items beginning with “A”, “B”, etc, then you will need to compute those into a chart and create your graph from there.
So let us say you want to count the number of items that begin with the letter “G” in column C. You could use the equation =COUNTIF(C:C,”G*”). This will give you a numerical value for “G” in your chart. Repeat this effort for your other alphabetic values and you will have created a chart for yourself.
I hope I answered your question. Let us know how it goes. Good luck.