Manager Keys can be programmed to the locks at any time.
Go to a lock requiring additional Manager Keys. Press C, Key Symbol, 5, 5, then Key Symbol. The LED will turn on.
While the LED is on, insert the Yellow Programming Key. A two-tone beep will be heard.
Insert each additional Black Manager Key one at a time. A two-tone beep will be heard for each Manager Key programmed.
Insert the Yellow Programming Key. A two-tone beep will be heard and the LED will turn off.
Repeat above steps for each lock or follow instructions to Express Register Manager Keys to program the same.