Hi.
Please, try the attached example, based on EntitySignal to check the arrival of an entity at a certain point, then setting the state in the SignalThreshold and using it as an ImmediateThreshold to release Entities from the EntityGenerator (previously set with InterArrivalTime = 0 s).
There are surely other smarter ways to do the same, for example using Attributes and setting them with the Assign function, in a more nested and programmatic way.
I prefer the method attached because it is almost auto explicative in graphical form.
Regards,
Lorenzo