W-2c as in corrected W-2?   

Same place as an original W-2 would be entered.  

Thank you for the response.  I did enter the W-2c under a W-2 and selected that this was a Corrected W-2.  The only line corrected was Box 10.  All other boxes were blank.  The ProSeries program states because there is no info listed in Boxes 1,3,5 that I cannot e-file the return.  Is there another possible solution that will still allow me to e-file?

Youd just add Box 10 to the original W2 figures.