hey John, you didn't mention what doesn't work. So first a really common
mistake amongst beginners is that this calculation is self-referencing
-- the calculation contains its own fieldname. In these cases, the
practice is to first create the calculated field, blank. Then you add
the calculation. So if you are getting an error rather than being able
to proceed with creating a calculated field, this is the solution.
Second, to add to what Doug has said, the field will only work from this
point fo...