Methods To Set Tag/Meta Data on Actors?

What methods do you all use to deal with things like friendly fire? Or overlap events that destroy some units but not others? I’ve considered using gameplay tags, but it seemed a bit cumbersome. I’ve considered setting variables too, that seems like an easy, straight forward method. I’m probably missing some other built in function that exist in UE-5, any advice?

The current situation I’m looking to apply this to is to multiple units in a multiplayer scenario. One player should be able to select their units and have them walk to their other units, or buildings with a click. The same click function should cause them to attack a hostile unit of another player, rather than executing a simple move action.