You get to take your personal itemized deductions or the Standard Deduction, whichever is larger. Don't confuse Itemized Deductions on Schedule A with Business expenses on Schedule C. You get to take both.
For Schedule C business expenses you can just enter the total for each category.
Where to enter expenses in the Online Self Employed version
https://ttlc.intuit.com/questions/3636848-where-do-i-enter-my-self-employment-business-expenses-like...
