There is an answerbook on EpicWeb I found handy for starting out if you have access to it.
Title is something like this: BAQ General Information on Calculated fields
Here is a section with a Month/Year example:
Create a MonthYear field.
this example you must set the data type to Character
and the format to X(7).
“99”) + “-” + string(Year(OrderHed.OrderDate),