Hi robs1,
You’re pretty much on the right track! For termination pay, you’d process the final standard pay as usual and lodge that, then create another pay for the unused leave, including any leftover hours worked in the last week, and the system will calculate the total automatically spot on there. You’re also correct that unused sick leave doesn’t carry over, so it just clears out, no dramas. See this link for more guide about this.
As for the ‘terminate pay’ box, there’s no specific box to tick for that in MYOB. Once you’ve finished their last pay, you’ll need to mark the employee as terminated in their card file under their Employment Details tab. That’s where you set the termination date.
Cheers,
Shella