I believe you are referring to the practice of taking a naturally occurring multi-hair follicular unit and cutting it into 2 or more smaller grafts. Sometimes this is done to generate more single hair grafts than occur naturally, when large numbers of single hair grafts are needed (e.g., to restore a hairline including the temples). But some clinics that charge by the graft routinely split up grafts in order to artificially inflate the total number and charge more. This usually does a disservice to the patient, since it is generally believed that keeping follicular units intact whenever possible (e.g., preserving a single 3-hair graft as opposed to cutting it into 3 single hair grafts or a single and a double) contributes to better survival and growth. It is important to research and interview your surgeon carefully.