Hierarchical Address Book in Office 365

Currently, our organization does not make supervisors visible in Office 365. All supervisors are input and updated in ADP. I can export ADP's hierarchy into an excel sheet. Can I upload this through the admin center to keep up-to-date changes without overwriting the existing data? Does anyone have any other suggestions to keep an up-to-date hierarchical address book without manually changing everyone's account whenever he/she has a different supervisor or direct report?