i have lots of tabs with lots of charts and diagrams that a phrase is repeated in them. now i should replace it with another phrase. so i should replace in any chart and any diagram expression. i want to know if there is somewhere or some way to do the replacement once?
Under Settings -> Expressions Overview, there is a find/replace function that you can try.
Using variables will also help minimize repetition of code. There are some advanced techniques to externalize all variable definitions (using INCLUDE statements) as well so you can do the find/replace in cool editors like notepad++.