Not sure that you do. What makes you think you do? You might need to allocate expenses to your rental/non-rental part and one way to do that might be by square feet. But I think you do that outside of TT and either enter a % if TT allows will split it up for you (I don't know that it does). If not you will have to a little bit of your own spreadsheet work and calculate the numbers to enter based on % yourself.
Here is a previous question about reporting airbnb income. I don't know about the Schedule C vs E issue but you will find discussion of that and further links below.
https://ttlc.intuit.com/community/investments-and-rental-properties/discussion/i-rent-one-of-the-roo...
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