2-tier commission structures

In our region, we typically have a 2-tiered commission structure for example, 7% on the first $100,000 & 2.5% on the balance for a listing and 3.255% on the first $100,000 & 1.1625% on the balance for the co-operating brokerage.

The system only allows for example, 3.5% listing & 1.25% co-operating commission.

Is it possible to include a 2-tiered commission structure?