Find a spare relay in the panel, for example 48.
Create Group X to be controlled by Schedule X, add the spare relay"48" to this group.
Setup your switch as a 14 btn switch regardless of the number of physical buttons.
Program buttons as desired for buttons 1-6 for function during non scheduled times.
In the setup option on switch change 7 on = Disable 1 thru 6.
Add relay 48 to button 7 on mode.
The reasoning here is that when relay 48 is on by schedule X, buttons 1-6 will be inactive because button 7 on = disable 1-6.