"Edit" or "Delete" W-2 in TurboTax amendment to submit W-2c corrections after filing? And do I also enter the original W2 figures that are blank on the W-2c?

My employer left off some of my income and sent me a W2C after I filed. It looks like my only options for amending is to add a W2, delete a W2 or edit a W2. There is no option for adding a W-2c. If I try to delete or edit, it pulls in my corrected info by looking up the EIN. Since my income changed but my tax withheld did not, the system is pulling in zero for tax withheld and it now looks like I owe a huge amount even though my original W2 showed a withholdings. Any experience filing a W2C properly in turbotax?