Is there a way that you can have an INCLUDE file or some other way that when you compile a project, it will substitute a change throughout the program no matter where it is found. As an example, let's say I need every instance of "It_Was_This" to be changed to "Now_It_Is_This"

So, the original code still says "It_Was_This" but the complied code actually reads "Now_It_Is_This"

Thanks in advance.....