Yes, you can amend your taxes to itemized deduction.
If you already filed and the return was accepted
by IRS, you have to wait until you receive your refund before you
can amend your taxes .
If your return is rejected or
not yet submitted, you
can edit any time and itemize your expenses.
See this TurboTax support FAQ for
amending a tax return - https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
