Use the values in the range C$9$:D$9$ to extend the list of years to the range E$9$:G$9.$

Use the values in the range $B10$:$B11$ to extend the list of reservoir numbers to the range B$12$:B$15.$

Use AutoFill to fill the range C$11$:J$15$ with the formatting from the range C$10.$J$10.$