Object Referencing & Sub Objects

[Bor]

I'm creating a game where several objects are used as pieces to form 1 enemy, building, etc.
For example, A building has the base, door, and roof.
I also have several of these groups being created throughout the level.
I'm trying to link the objects by setting their "alterable value a" to the same unique number so I could reference all objects with "alterable value a" equal to the base object. But Fusion can't seem to pick the right one (I destroy one building base and the roof gets destroyed off another building).
I can't use qualifiers because I'm trying to break out multiple versions of the same object (base 1, base 2, roof 1, roof 2) and qualifiers will just lump them all together.
Is there an efficient way to link objects?
Thanks for any help!

[DJFuego]

Spread an equal value amongst the objects and when you hit the object the value for that object decreases, when the value hits 0 make an event to destroy that piece. You can use widgets for each object but still group the objects using the qualifiers.

[TreeHugger]

I'm trying to link the objects by setting their "alterable value a" to the same unique number so I could reference all objects with "alterable value a" equal to the base object. But Fusion can't seem to pick the right one (I destroy one building base and the roof gets destroyed off another building).

Make sure you have events which always set the pieces with the same value together