Your heats may have athletes from multiples divisions sharing the floor at once - for example, in 10 lanes, you may have 5 scaled and 5 RX lanes.

To set this up, start at your competition dashboard and select "Scheduling" followed by "Time Blocks".

When you’re creating a time block for your mixed division heats, add different divisions for the same workout. When you do that, you’ll see a “Merge Divisions” option. When you click on that, you’ll see that there’s a way to partition the lanes to accommodate the different divisions.