How can I make STAR a group and ROCKER a group so that I do not have to fill in all the LEDs separately.
Basically you can’t you will always have to light the LEDs separately.
At the simplest level you write a function that will fill a range of led numbers passed to it with a colour you pass to it. Then you call that function with the appropriate numbers for what you want to do.
You can write other functions that call that function to do things like define a colour scheme for all the LEDs and call that up when you need.