The employer filled out the W-2C incorrectly.  The W-2C is to show the entire correct amount not just the change.  You can and should ask them to complete the W-2C with the correct complete information.  You can file the return without it by combining the two W-2's but the IRS will hold your refund until you provide an explanation for the differing amounts.  There is no shortcut to this.

W2-C information is entered in the same area as an original W-2.  

You do not generally enter the W-2C as a new W-2 in its entirety.  Instead, you substitute the information on the W-2C for the information reported on the one with all the boxes filled in.  Then, on the follow-up screen after you have entered the new information, there will be a list of several questions asked -- Do any of these uncommon situations apply to this W-2?  Be sure to check the box for corrected W-2.

After you are finished, your return should have only one W-2 for the employer. 

@Mendc10

Thanks for the reply Lamontjon! Appreciate the input.

Hi AnnetteB6! 

I want to proceed using both the original W-2 and the W-2c, however I've seen a couple of posts indicating if I consolidate the information into one W-2 input - the IRS will question why the W-2 and the W-2c have different information. I can't attach the W-2c solely because it's missing information from the original W-2 - are you saying that if I just consolidate the two and flag this W-2 is corrected, wouldn't the IRS kickback after reviewing both W-2's.

I guess in short - my follow-up question is: Which W-2 should I be attaching? If I only attach W-2c, it only shows partial information.

Usually a corrected W-2 has all of the data, but since yours doesn't, I would use the data from your original W-2 and replace the amounts on the original W-2 with those populated on the corrected W-2.