Originally Posted by
DorfSchrat
Maybe i can get you into the right direction.
What you request only works for bosses, players, your target and your focus, as they are defined as UIDs and kind of unique. For trashmobs / adds you can only use "fire and forget" timers that show you how long a debuff on a target last, but there is no link to the target itself. Solution here would be nameplates with debufftimer.
So for the 1st boss its kind of easy. Just create a set of debuffs / dots you want to track. For more than 2 debuffs i would prefer a dynamic group, sort by duration left. Set the target to a specific one and the name to boss1. Repeat for boss2, boss3 and boss4.
Then all you need is either an additional castbar for the 4 mobs or you put macros with target modifiers into your main castbar (boss1, boss1...)