Service items are an advanced option you can utilize when building your orders to link up "what" is being serviced by your line items. Example: If you are cleaning a rug then the line item would be "cleaning" and the service item would be the rug itself. If you utilize this level of tracking you can more easily capture when the last time a particular item was serviced and can help become the expert on your client's home. You will also save a considerable amount of time on repeat business as all of the rooms, surfaces, items, etc that were serviced will be saved to that service location.