I have 8 lists of data in columns F1-13 through M1-13. What I need to do is make a data validation list in column C and D. Column C should be able to select ANY of the data from the 8 columns, Column D needs to be dependent on column C. If the data in column C is from column F or G then the data in column D can not be from F or G but can still be from the other 6 columns. Is that understandable? Any help?