If you work in more than 1 state, sometimes they will give
you another W2 with the extra state information on it and the top part
the same or not filled in. If this is the case, list one W-2 but include
all state taxes on it. TurboTax will let you type in more that one line for
boxes 15-20.
To enter multiple W-2's with different state information, see the following
TurboTax FAQ: