Prestige Platinum APS-510C Owner's Manual page 13

For additional channel programming beyond the 1 option button, you can use
any unused button or combination of buttons not in use.
In other words, to access option channel 5, 6, 7, you would do the following:
From step 3 above:
a) Press and release the valet/programming button 4 additional times to get to
channel 5, then press any unused transmitter button or button combination to
program.
b) From a, press and release the valet/programming button 1 time to get to
channel 6, then press any unused transmitter button or button combination to
program.
c) From b, press and release the valet/programming button 1 time to get to
channel 7, then press any unused transmitter button or button combination to
program.
Note: Not all systems have channels above 3, check with your installation
center for options your system may or may not have.
Note: Certain systems have the ability to utilize channels 6 & 7 for driver priority
programming. For driver priority, the vehicle must be equipped with this
feature, and the optional feature must be set up and installed by your
installation center. Once this feature is added when the unlock button of
transmitter 1 is used, it will set driver 1 priority, and when the unlock
button of transmitter 2 is used it will set driver 2 priority. In this situation,
the unlock button can be programmed into two receiver channels,
unlock, channel 2 and driver priority 6 or 7. In no other circumstance will
the system allow a transmitter button to be programmed into 2 receiver
channels at the same time.
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