You enter them in the Job-Related expenses area of Deductions & Credits.  Below are the steps to enter your qualified job-related expenses into TurboTax.

These expenses go on Schedule A Itemized Deductions where they are subject to the 2% of adjusted-gross-income limit.  This means only the amount over 2% of your adjusted gross income will be deductible on the Schedule A. If you have enough expenses, and typically itemize your deductions, it may benefit you.

Where do I enter job-related expenses?

https://ttlc.intuit.com/replies/4800418