If you are an employee and were not reimbursed by your employer for the professional licensing fees, they are reported on Form 2106 and considered a miscellaneous itemized deduction subject to a 2% Adjusted Gross Income threshold on Schedule A.
See the TurboTax FAQ Where do I enter job-related employee expenses? (Form 2106) that explains how to enter:
https://ttlc.intuit.com/replies/4800418
If the licensing fees are related to self employment, independent contractor or sole proprietor income, then they are deductible on Schedule C Profit or Loss From Business (Sole Proprietorship).
See link below that explains how to enter Schedule C Income & Expenses:
https://ttlc.intuit.com/replies/3302122