I would have to think there is a key binding or something I can click to line actors up with one another? Lets say I am looking at 3 box actors from top view. They are all close, but I want them exactly lined up. I would imagine I would grab them all by holding down the left mouse button, but I am unsure how to line them up. Thanks.
Take a look at vertex snapping -> https://docs.unrealengine/latest/INT/Engine/Actors/Transform/index.html#vertexsnapping 