When setting up a new property, Renting Well will ask you whether it is a multi-unit or single-unit:

• A multi-unit property is a rental property that has been divided into multiple units that are rented independently to different tenants. A duplex, a triplex, or an apartment building would all be multi-unit properties. If you’re operating a multi-unit property you must add each unit individually so that you can attach its respective tenant and lease information.
• A single-unit property is a rental property that is rented as a single entity. A condo, a townhouse, or a vacation rental would typically be single-unit properties. If you’re adding a single-unit property to Renting Well you don’t need to add individual units – the tenant and lease are associated to the property itself.