Investors & landlords

I am looking for a simple answer to "Part of the basis" phrase above - mainly - WHERE is that information entered. Is this a single field, or a panel (such as Enter Common Expenses) where all the entries get applied to basis. I am 'around' the area (Rental and Royalty Summary) but not locating a field for basis, or any screen w/the word basis that has data entry. (for a rental property)