Employers use Box 14 on Form W-2 to provide just about any other information imaginable to employees. Generally, the amount in Box 14 is for informational purposes only; however, some employers use Box 14 to report amounts that should be entered elsewhere on your return.
The program cannot really determine your employer's intent based upon the code or abbreviation used. Reason being, that employers use it for so many different things, that there is not a defined list of abbreviations.
You basically have two options:
1) Keep trying to find someone at your employer that knows what it is
OR
2) File your return without entering any information in Box 14. Like I said, it is most often used for informational purposes and usually has no effect on your return.
