You can create a "project-level" string variable that get saved with the project. You simply omit the data type specifier (string). For example:
long_str$ = "All work and no play makes Jack a dull boy.All work and no play makes Jack a dull boy.All work and no play makes Jack a dull boy.All work and no play makes Jack a dull boy.All work and no play makes Jack a dull boy.All work and no play makes Jack a dull boy.All work and no play makes Jack a dull boy.All work and no play makes Jack a dull boy.All work and no play makes Jack a dull boy.All work and no play makes Jack a dull boy.All work and no play makes Jack a dull boy.";
long_str$=;
Thanks, Chris Drozdowski Originlab Technical Support