TransportIn triggers

Hi All,
I’m a new user and I am trying to set up some simple processes which are commonly used in our business.
I have a human resource looking to place a component (Component A) over another (Component B) which is travelling along a conveyor.
At this time I have the process working but the human will only start picking up Component A once component B has reached the process node on the conveyor.
However, I want to make this more realistic, whereby the human resource will pick up Component A prior to component B arriving to the process node. This would replicate the true behaviour much better.
How do I go about this?