I can think of two options:
1) You can use the "for each actor of type" loop to get actors created dynamically.
That's especially usuful if there is always only on actor of that type.
2) Remember the actor when you create it. Create an actor attribute in the behavior where you create your actor. Then, right after the "create actor type at ..." block, put "set YourActorAttribute to <Last Created Actor>". You can use this attribute in this behavior directly or if you need to access it from other behaviors, you can do it with messaging blocks.