We have enabled a 'furnished' field that will pull through to relevant portals that support it, including Property24 and Private Property. This is how you can select it in the various systems:
Your office administrator need to go to settings, parameters. Choose 'Office:Property features list, residential' and add 'Furnished' (case sensitive). Press save.
You can also contact the Entegral Helpdesk to enable for you
Going into a listing you will notice the Furnished field you can select to show a property is furnished: