Hi Julian,
As you did not specify which device you are using, I (wrongly) assumed you are using an ARM Cortex :-(.
For the S08 (using S08QE128 below) it is basically on the top level the same: specify the timer/interrupt source and period:

This then will call the TI1_OnInterrupt() event for every timer interrupt:

The function/hook is generated into Events.c:

I hope this helps,
Erich