You should be able to set up one plan where you rent, then clone that plan and make some changes to add a house, and flip back and forth between the two plans to see the differences. Or, another way to do it is to make a single plan for renting but then add a house asset to it configured to cancel rent expenses when in effect, which you can toggle on and off by clicking the icon. When you add a house to a plan, it should ask you whether you'll be paying in full or financing it. If the latter, then it should provide options for interest rate, down payment, monthly payment, and such.