Is there a way to get Tennessee selected in Box 15 to reflect Box 16 state wages? I have Texas and Tennessee income wages, I understand neither state have State Taxes.

Several  states do not have a state income tax.  So these states will not show up in certain drop down lists.   Leave boxes 15, 16, and 17 blank when you enter a W-2 for these states.

Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington and Wyoming