Electronic assigning of expense data related to sales calls to customers such as health care professionals (HCPs) aids in complying with local, state, federal, or other regulatory reporting requirements and guidelines. The method includes providing expense report data and presenting a line-item entry of the report on a display. Through a user interface, one or more customers included within a database are selected. An expense amount associated with the line-item entry is automatically allocated into dollar amounts among the selected customer(s) and entries in the database are updated for each selected customer to now include the allocated dollar amounts.