Turbo Tax only allows for 4 inputs to section 12 a-d on the w2. My employer has provided two inputs for 12a. How do I enter this into Turbo Tax?

I have two W2's from my employer with the first complete and the second only having information in box 12a.  Should I enter two W2's since there is no additional box to enter another input into section 12 a-d?  The first W2 has 4 inputs for section 12 a-d on the W2 and have inputs for all 4.