You can use a Flow Splitter and a passage way to cause some agents to utilize the other stairs.
In the image I used a flow splitter with a single line destination and a 50% chance to cause each agent to travel to the line destination. To add a flow splitter, in Model Layout < Actions on the left is the flow splitter action.
Update the flow splitter to a single line destination as well change the Destination type to “Condition” and update the condition to
. Move the line destination to the desired position.
It may be necessary to add a passageway in the corridor before the flow splitter line destination. Without the passageway agents may just travel to the destination line and turn around to the other stairs. It depends on the position of the destination line and the travel cost to the stand.
The passageway will automatically cause the agents to continue along the new path to the other stairs. Update the passageway Direction setting, the arrow should point to the flow of the route.
NOTE: This passageway is not part of the stadium infrastructure and I suggest that you label it as such. Also, you might want to turn of the visibility.
If your agent generator is the same as the previous demo models, them the generator is not repeating.
Update the agent generator Repetitive Mode to RepeatTime and Nr Time to Repeat to 10. The repeat time is the length of time before the arrival list is repeated. I have mine repeat time set to mins(15), however that will create a 150 minute ingress, you should adjust that time site specific value.