entity in custom groups (and use them in ai-tasks)

Hello everbody!

I need some help: Is it possible to create own entity groups with several entities in it and use this groups in ai-tasks. This would make the ai-task creation much easier and quicker. So, if I want to make a new agressive mob which attacks several entities, i dont always have to select all the entities which takes a long time with big mods. Instead, I just have to select the group and I am done with it.