I can easily create a column of numbers that increase in increments of 1 in each successive cell by adding 1 to the cell above. The first cell is the only cell where I manually input a number. I want to set a column so that I can input a letter, say E, in the top cell and the cells below will fill in with F, G, H, etc. If this can be done, am I limited to a maximum of 26 cells to match the number of letters in the alphabet, or can I go into letters like AA, AB, AC, etc.