TurboTax does provide a screen in the K-1 interview where you can enter you unreimbursement business expenses.
In the screen "Describe this Partnership", there is an option which you should check whic says: I am required to pay supplemental business expenses on behalf of this partnership/LLC for which I am not reimbursed.
When you check this option, there will be a screen where you can enter your unreimbursed business expenses.
Please also read this Community answer which provides useful information.
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