Although the Tax Cut and Jobs Act of 2017 eliminated most unreimbursed employee business expenses (this is what we are talking about), not all states did.
If I understand what question you are referring to, it is likely being asked because it may be useful at the state level. In most cases, TurboTax has you enter data on the federal return which carries to the state(s), and as you are entering the federal return, TurboTax doesn't know yet if you will need it on a state.
When in doubt, enter the data asked for so that TurboTax can give you the optimal tax treatment.
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