Easy one :P
Supposing that the names you want to appear in the graphs are in that range...
A better/simpler solution would be to use a sheet-level named range for the cells that you want to reference... ie, a named range for 'Main Sheet' (not for the book!) called "xNames" = $AC$3:$AC$100
Thus, this sheet-level named range would get copied to the rest of the sheets when duplicating it:
so you don't have to worry about changing the range address in the code if you ever modify the template sheet.
Hope it helps!
Bookmarks