Hi,
In the figure 6 page 8 from 4794's datasheet, you will find an example of cascading driver (up to 16 LED with 2 drivers).
Of course you can repeat the cascade (extend the daisy chain) by adding more 4794 circuits in the same manner.
You must modify the program to control new leds. You need more PulseClock(). You can extend the for loop (up 16 with 2 x 4794) and change : if (count == 7){ to if (count == 15){ .
auguste.