The manual has grading from A to B C cup etc and 34B - 32B etc inc B - A & AA plus a lot more and a few pantie girdles.

If you need to know how to grade bras this is well worth the money as the principles do not age and could be passed on again and again.  

I was taught to grade in 1970 by a French designer at a company called Gordonia Debrette who were bought out by Warner's underwear in the early 1970's