Sketch, Part and Assembly References

Hi, I have an issue with parts/assemblies that I have created. I have modeled a part which had multiple bodies in it. I created new parts off some of the bodies within oringal part.

I then created an assembly (1) with some of these new parts. Another assembly (2) was then created only using one of these new parts + parts from library. Now every time I open and look at new  part that was added to Assembly (2) every part + Assembly (1) opens up within solidworks window thus slowing my system down. Is there a method of disconnecting or unattaching the related references that were created. I still have this problem even if parts are saved as copy and refs taken off. any one with a solution.
SolidworksParts And Features