A land parcel is added by capturing a parcel type (fallow land, water body, pasture land, etc.), a unit (hectare, acre, m2, etc.) and a quantity. Should you link a parcel to an actual polygonal geometry, then the quantity and unit fields are automatically populated using the polygon’s size. For your information, when using rates for parcels, they are based on the combination of type and unit, and multiplied by the quantity. It is also possible to provide a negotiated rate for the parcel when applicable.