This falls under the category of "Unreimbursed Partnership Expenses" (or UPE). Both the K-1 amounts as well as the UPE can be reported through the K-1 interview. At the end of this answer, I will provide an FAQ which provides instruction on how to access the K-1 interview. About halfway through the K-1 interview, you will see a screen entitled Describe the Partnership. The first checkbox says "I am required to pay supplemental expenses on behalf of this LLC/Partnership for which I am not reimbursed." Click on that box in order to generate the interview to enter your unreimbursed partnership expenses. (You might have to manually calculate the home office expenses and enter into the system as a final amount. If this is the case, keep a record of your calculations available if the IRS asks for them).
To access the K-1 interview, please follow the instructions in this FAQ: https://ttlc.intuit.com/replies/3301717
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