If this was rental property you sold, you start reporting the sale in the Rental & Royalty Income section. This way the disposal of the rental assets (as sold) is accounted for. You'll get to a point where it will ask if it's an installment sale. Select YES and the interview will guide you through the process.
If you have more than one asset listed in the rental assets section, let me know and I'll help you with a shortcut so you don't have to go through the installment sale process with each individual asset.
