Currently i have an assembly(A) which has 3 sub assemblies (B,C,D) combined and various components.

The sub assemblies Components are mated in the main assembly(A) (its where the references are). Everything mates up perfectly, but when i open  the sub assembly (B for example) all the components are un-mated and floating. Im needing the sub assemblies so i can view them as "systems" but need them to use the mates in from the main assembly (A).... is this possible?

The sub assemblies are set to floating so i can mate them in the main assembly (A) if that makes sense.