You should see a screen in TurboTax when you enter your partnership K-1 schedule that says "Describe this Partnership" and one of the options is "I am required to pay supplemental business expenses on behalf of this partnership/LLC for which I am not reimbursed."
Once your check that box, you should be allowed to enter your home office expenses as a single line item, under "Miscellaneous Supplemental Expenses."
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