There is no Tier 1A and 1B. Perhaps your employer has broken out the two pieces of the 7.65% Tier 1 withholding, which is 6.2% for retirement and 1.45% for Medicare. Calculate the percentages of the entries for 1a and 1b and if they are 6.2% and 1.45%, that is what they did. Your not going to find a Tier 1a and Tier 1b option in the W-2 box 14 entry in TurboTax, or any other tax prep software for that matter. You should add the two together as enter as a single entry.
You can also ask your employer's payroll department what Tier 1a and 1b is - they should know.
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