Box 14 is used by employers to report any information that does not belong in any other boxes or just miscellaneous information. Most of what is reported on Box 14 has no impact on your tax return.
In TurboTax, enter the description from your W-2's box 14 on the first field in the row. Enter the dollar amount and select the correct tax category that goes with that description. If none of the categories apply, scroll to the bottom of the list and choose Other (not classified). If box 14 is blank, just skip over it. Don't enter a 0 for any blank boxes. If there is no description just enter Other or ignore those entries.