Track capital contribution

I have a single member LLC for a rental property (small multifamily). Since this is a single member LLC, I don't need to file Form 1065, and doing everything on Sch E.

I wonder how to track the capital contribution to the LLC/rental property, such as down payment. AFAIK, the income from rental property will offset by the contribution before it is taxable (return of capital), but I cannot find how turbotax is tracking the capital I put into the property (down payment or money to cover repair)?

Thanks.