If there is no change for that field, you do not need to enter the data.

Please check this guide for W2C form
http://www.halfpricesoft...ut_file_w2c_irs_form.asp 

Boxes 1 through 20. For the items you are changing, enter under “Previously reported” the amount reported on the original Form W-2. Enter under “Correct information” the correct amount. Do not make an entry in any of these boxes unless you are making a change. If you do not enter the correct amount for one field, ezW2Correction software will leave that field blank when printing form.

Please feel free to contact us if you still have any questions. For instantly support, you can request live chat during weekdays
http://www.halfpricesoft.com/support.asp 

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I am trying to use your W-2C form and it will not allow me to save it as it says my Federal Withholding Tax should be different but at present there was no increase of Federal Withholding as according to computing program there was no increase in Federal Withholding just Social Security & Medicare. I need help with this matter in order for program to produce W-2C for my client.