How can i use a class of actors in my "actors to ignore" on my line trace?

[BrUnO_XaVIeR]

Use Object Types, like in the image above;
Everything that should be ignored is set to a different Object Channel group.

Collision

I use them in my game to detect which objects can be manipulated or not; Whatever is from the WorldStatic group for example, the Line Trace will ignore.